Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Cash flows from operating activities
Net loss	$ (2,174)	$ (44,937)	$ (5,805)	$ (46,921)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	3,090	3,265	8,939	10,438
Stock-based compensation expense			4,219	3,624
Bad debt provision			1,447	888
Implementation cost amortization			250	344
Goodwill impairment	0	27,887	0	27,887
Intangible and long-lived asset impairment	0	16,818	0	16,818
Change in fair value of warrant			950	0
Change in fair value of embedded derivative			(97)	0
Unrealized foreign exchange loss			986	0
Other operating activities			705	(189)
Change in assets:
Accounts receivable and unbilled revenue			(21,245)	5,810
Inventories			(8,767)	(16,469)
Prepaid expenses and other assets			(29,141)	(7,903)
Change in liabilities:
Accounts payable			12,403	20,350
Accrued expenses and other liabilities			25,378	(4,572)
Net cash (used in) provided by operating activities			(9,778)	10,105
Cash flows from investing activities
Purchases of property and equipment			(10,012)	(7,835)
Payments for acquisition, net of cash acquired			(390)	0
Net cash used in investing activities			(10,402)	(7,835)
Cash flows from financing activities
Short-term secured repayments			(833)
Short-term secured borrowings				55
Repurchases of common stock			0	(25,689)
Proceeds from exercise of stock options			63	416
Payment of debt issuance costs			(5,488)	(545)
Other financing activities			(242)	(746)
Net cash provided by (used in) financing activities			31,139	(3,279)
Effect of exchange rate changes on cash and cash equivalents			759	(1,958)
Increase (decrease) in cash and cash equivalents			11,718	(2,967)
Cash and cash equivalents, beginning of period			26,770	30,562	$ 30,562
Cash and cash equivalents, end of period	$ 38,488	$ 27,595	38,488	27,595	$ 26,770
Revolving credit facility | Credit Agreement
Cash flows from financing activities
Repayments on credit facility			(142,583)
Proceeds from credit facility				23,230
Revolving credit facility | ABL Credit Agreement
Adjustments to reconcile net loss to net cash from operating activities:
Change in fair value of embedded derivative			58
Cash flows from financing activities
Proceeds from credit facility			81,472	0
Term loan facility | Term Loan Credit Agreement
Adjustments to reconcile net loss to net cash from operating activities:
Change in fair value of embedded derivative			39
Cash flows from financing activities
Repayments on credit facility			(1,250)	0
Proceeds from credit facility			$ 100,000	$ 0