Significant Accounting Principles and Policies - Narrative (Details) - USD ($)	3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 29, 2020	Jun. 28, 2020	Sep. 27, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Apr. 03, 2020
Product Information [Line Items]
Impairment of long-lived assets				$ 0	$ 0	$ 0
Impairment of equity method investments				$ 0	0	0
Class of warrant or right, outstanding (in shares)				19,999,985
Change in fair value of Warrant liability	$ 33,599,000	$ 14,132,000	$ (382,000)	$ 16,132,000	$ 0	$ 0
Other Income
Product Information [Line Items]
Change in fair value of Warrant liability				$ 16,100,000
Class A Common Stock
Product Information [Line Items]
Number of securities called by each warrant or right (in shares)				1
Exercise price of warrants or rights (in dollars per shares)				$ 11.50
Expiration period of warrants (in years)				5 years
Public Warrants
Product Information [Line Items]
Redeemable price of warrants or rights (in dollars per share)				$ 0.01
Public Warrants | Class A Common Stock
Product Information [Line Items]
Class of warrant or right, outstanding (in shares)				13,333,319			13,333,333
Private Placement
Product Information [Line Items]
Redeemable price of warrants or rights (in dollars per share)				$ 0.01
Private Placement | Class A Common Stock
Product Information [Line Items]
Class of warrant or right, outstanding (in shares)				6,666,666			6,666,666
Share price threshold (in dollars per share)				$ 18.00
Number of trading days				20 days
Trading day period				30 days
U.S. Government Agencies | Accounts Receivable | Customer Concentration Risk
Product Information [Line Items]
Concentration risk (as a percent)				91.40%	96.00%
U.S. Government Agencies | Revenue Benchmark | Customer Concentration Risk
Product Information [Line Items]
Concentration risk (as a percent)				90.00%	93.00%
Minimum
Product Information [Line Items]
Customer account due period (in days)				30 days
Minimum | Machinery and equipment
Product Information [Line Items]
Useful life of property and equipment (in years)				4 years
Minimum | Computer and equipment
Product Information [Line Items]
Useful life of property and equipment (in years)				3 years
Minimum | Transportation equipment
Product Information [Line Items]
Useful life of property and equipment (in years)				4 years
Minimum | Furniture and fixtures
Product Information [Line Items]
Useful life of property and equipment (in years)				5 years
Minimum | Leasehold improvements
Product Information [Line Items]
Useful life of property and equipment (in years)				3 years
Maximum
Product Information [Line Items]
Customer account due period (in days)				45 days
Maximum | Machinery and equipment
Product Information [Line Items]
Useful life of property and equipment (in years)				20 years
Maximum | Computer and equipment
Product Information [Line Items]
Useful life of property and equipment (in years)				7 years
Maximum | Transportation equipment
Product Information [Line Items]
Useful life of property and equipment (in years)				11 years
Maximum | Furniture and fixtures
Product Information [Line Items]
Useful life of property and equipment (in years)				12 years
Maximum | Leasehold improvements
Product Information [Line Items]
Useful life of property and equipment (in years)				16 years