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Restatement and Revision of Quarterly Condensed Consolidated Financial Statements - Consolidated Balance Sheet Adjustments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Current assets:                  
Unbilled receivables $ 138,813 $ 143,514 $ 156,887 $ 172,757 $ 184,366 $ 182,934      
Prepaids and other current assets 15,881 16,292 18,080 17,042 18,512 9,812      
Total current assets 699,712 727,270 707,796 679,456 664,667 656,437      
Property, plant and equipment, net 57,693 59,425 50,858 48,154 45,536 38,571      
Unbilled receivables, long-term 236,699 265,701 294,986 319,494 347,348 378,430      
Total assets 1,251,409 1,316,551 1,324,138 1,325,390 1,343,441 1,301,626      
LIABILITIES & STOCKHOLDERS' EQUITY                  
Deferred tax liabilities 14,276 15,090 14,675 14,140 13,846 13,724      
Total liabilities 338,703 350,723 351,408 353,793 368,068 338,544      
Accumulated deficit (357,751) (314,205) (301,468) (292,328) (285,789) (278,913)      
Total stockholders’ equity 912,706 965,828 972,730 971,597 975,373 963,082 $ 973,226 $ 1,012,112 $ 571,584
Total liabilities and stockholders’ equity 1,251,409 1,316,551 1,324,138 1,325,390 1,343,441 1,301,626      
As originally reported                  
Current assets:                  
Unbilled receivables 135,897 141,341 155,448 172,042          
Prepaids and other current assets 15,907 16,229 17,970 17,057 18,524 9,824      
Total current assets 696,822 725,034 706,247 678,756 664,679 656,449      
Property, plant and equipment, net       47,743 44,714        
Unbilled receivables, long-term 232,056 260,404 289,044 314,706 343,703 376,619      
Total assets 1,243,876 1,309,018 1,316,647 1,319,491 1,338,986 1,299,827      
LIABILITIES & STOCKHOLDERS' EQUITY                  
Deferred tax liabilities 14,336 15,139 14,724            
Total liabilities 338,763 350,772 351,457            
Accumulated deficit (365,344) (321,787) (309,008) (298,227) (290,244) (280,712)      
Total stockholders’ equity 905,113 958,246 965,190 965,698 970,918 961,283      
Total liabilities and stockholders’ equity 1,243,876 1,309,018 1,316,647 1,319,491 1,338,986 1,299,827      
Adjustments                  
Current assets:                  
Unbilled receivables 2,916 2,173 1,439 715          
Prepaids and other current assets (26) 63 110 (15) (12) (12)      
Total current assets 2,890 2,236 1,549 700 (12) (12)      
Property, plant and equipment, net       411 822        
Unbilled receivables, long-term 4,643 5,297 5,942 4,788 3,645 1,811      
Total assets 7,533 7,533 7,491 5,899 4,455 1,799      
LIABILITIES & STOCKHOLDERS' EQUITY                  
Deferred tax liabilities (60) (49) (49)            
Total liabilities (60) (49) (49)            
Accumulated deficit 7,593 7,582 7,540 5,899 4,455 1,799      
Total stockholders’ equity 7,593 7,582 7,540 5,899 4,455 1,799      
Total liabilities and stockholders’ equity $ 7,533 $ 7,533 $ 7,491 $ 5,899 $ 4,455 $ 1,799