Our success depends on our ability to complete timely and satisfactory performance on our existing customer projects and to secure additional grants and contracts. Performance delays, cost overruns, technology failures, materials or components shortages, or contract delays, could negatively impact our business prospects, results of operations, financial condition and liquidity. U.S. government contracts generally permit the government to terminate the contract, in whole or in part, without prior notice, at the U.S. government's convenience or for default based on performance. Correspondingly, subcontracts which we may seek to enter with prime government contractors, may be terminable by the prime contractor upon government termination of the prime contract. We may be unable secure additional contracts to offset any revenues lost as a result of the termination of any such contracts.
Because the funding of U.S. government programs is subject to congressional appropriations made on a fiscal year basis even for multi-year programs, programs are often only partially funded initially and may not continue to be funded in future years. Appropriations bills may be delayed, which may result in delays to funding, the collection of receivables and our contract performance due to lack of authorized funds to procure related products and services. Under certain circumstances, we may use our own funds to meet our customers' delivery dates or other requirements, and we may not be reimbursed. If appropriations for programs are reduced or delayed, the U.S. government may terminate any contract or subcontract under that program.
The growth of our business depends on the development, application and manufacture of advanced technology and products aimed at achieving challenging goals. New technologies may be untested or unproven and, in some instances, product requirements or specifications need to be developed. This could result in performance difficulties, delays, cost overruns or failures which could require additional resources to address. Any failure to execute timely and effectively on our current programs could hamper future contracting opportunities. We may also need to invest in internal research and development projects in order to achieve certain grants or contracts, as our customers may demand proven concepts and solutions. These expenditures may not pay off if we are not awarded the intended grants or contracts.
Under certain types of government contracts, if we are unable to control costs or if our initial cost estimates are incorrect, our profitability could be negatively affected, particularly under fixed-price development contracts. We may also experience cost underruns which would reduce contract value and related expected revenues, and we may be unable to expand the contract scope or secure additional work to offset the resulting lost revenues. Contracts for development programs with complex design and technical challenges may be cost reimbursable. However, if they are firm fixed price or fixed price incentive contracts, such challenges and unexpected cost increases may impact our results of operations. US government contracts also require compliance with extensive and evolving procurement and other rules and regulations and subject us to potential audits, investigations, and disputes. We may also become involved in programs that are classified or otherwise restricted by the US government, which place limits on our ability to discuss our performance on these programs, including any risks, disputes and claims.