Revision of Prior Period Financial Statements - Revised Consolidated Statements of Cash Flows Amounts (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net (loss) income	$ (6,461)	$ (1,062)	$ (508)	$ (2,044)	$ (29,390)	$ (45,120)	$ (299)	$ (1,874)	$ (2,552)	$ (2,173)	$ (3,614)	$ (47,293)	$ (10,075)	$ (76,683)	$ 15,869
Deferred income taxes													(879)	(4,604)	4,073
Accounts receivable and unbilled revenue				3,928					(10,099)		(21,488)		(12,254)	4,470	(41,871)
Inventories				9,165					4,582		(8,913)		20,980	(16,039)	(4,245)
Prepaid expenses and other assets				274					(4,163)		(28,985)		(6,529)	2,120	(13,882)
Accounts payable				(9,207)					(18,146)		12,078		(15,634)	21,585	18,096
Accrued expenses and other liabilities				(610)					22,551		23,868		22,843	5,190	12,107
Net cash (used in) provided by operating activities				5,492					1,289		(9,655)		22,470	23,058	11,698
Cash flows from investing activities:
Purchases of property and equipment											(10,135)		(13,378)	(11,263)	(12,483)
Net cash used in investing activities											(10,525)		$ (14,099)	(11,141)	(12,483)
As Reported
Cash flows from operating activities:
Net (loss) income		(2,174)	(1,169)	(2,462)	(29,250)	(44,937)	(299)	(1,684)	(3,631)	(1,983)	(5,805)	(46,921)		(76,171)	16,430
Deferred income taxes														(4,441)	4,072
Accounts receivable and unbilled revenue				3,924					(10,225)		(21,245)			4,112	(41,877)
Inventories				9,149					4,488		(8,767)			(16,325)
Prepaid expenses and other assets				116					(4,318)		(29,141)			1,432	(13,547)
Accounts payable				(8,351)					(17,670)		12,403			21,959	18,152
Accrued expenses and other liabilities				(870)					23,529		25,378			5,473	11,162
Net cash (used in) provided by operating activities				5,492					1,289		(9,778)			23,058	11,698
Cash flows from investing activities:
Purchases of property and equipment											(10,012)
Net cash used in investing activities											(10,402)
Adjustments
Cash flows from operating activities:
Net (loss) income		$ 1,112	$ 661	418	$ (140)	$ (183)	$ 0	$ (190)	1,079	$ (190)	2,191	$ (372)		(512)	(561)
Deferred income taxes														(163)	1
Accounts receivable and unbilled revenue				4					126		(243)			358	6
Inventories				16					94		(146)			286
Prepaid expenses and other assets				158					155		156			688	(335)
Accounts payable				(856)					(476)		(325)			(374)	(56)
Accrued expenses and other liabilities				260					(978)		(1,510)			(283)	945
Net cash (used in) provided by operating activities				$ 0					$ 0		123			$ 0	$ 0
Cash flows from investing activities:
Purchases of property and equipment											(123)
Net cash used in investing activities											$ (123)