Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Cash Flows [Abstract]
Net loss	$ (22,280)	$ (13,389)	$ (26,241)
Adjustments to reconcile net loss to net cash provided by operating activities:
Share-based compensation	4,908	4,228	3,472
Depreciation and amortization expense	23,888	22,110	13,855
Impairment of goodwill from discontinued operations	0	0	6,980
Loss on extinguishment of debt	11,676	0	0
Non-cash interest expense	4,129	7,252	6,294
Write-off of deferred financing costs	0	0	340
Loss (gain) on disposal of assets	3,205	5	(3,447)
Asset impairment charges	4,266	0	3,568
Deferred taxes	(4,604)	(10,895)	1,962
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable, net	22,219	(12,867)	6,245
Unbilled receivables, net	(20,406)	8,865	9,271
Inventories, net	(430)	(8,527)	(1,296)
Prepaid expenses	(728)	707	(775)
Accounts payable	(10,031)	11,689	(4,694)
Accrued expenses	(1,310)	(350)	6,240
Other non-current assets and liabilities	(1,461)	(2,328)	447
Net cash provided by operating activities	13,041	6,500	22,221
Cash flows from investing activities:
Acquisitions, net of cash acquired	0	(235,856)	(2,504)
Purchase of property and equipment	(4,932)	(6,419)	(17,536)
Proceeds from sale of assets	0	0	16,226
Net cash used in investing activities	(4,932)	(242,275)	(3,814)
Cash flows from financing activities:
Payment of debt extinguishment costs	(711)	0	0
Settlement of capped call transactions	2,118	0	0
Principal payments of convertible senior notes	(126,892)	0	0
Proceeds from stock issuances, net	0	84,586	0
Proceeds from issuance of term note	290,000	135,000	0
Principal payments of term loan	(146,625)	(3,375)	0
Payment of debt issuance costs	(7,482)	(4,688)	0
Proceeds from revolver	25,000	10,000	0
Repayment of revolver	(25,000)	(10,000)	0
Other	(216)	213	2,237
Net cash provided by financing activities	10,192	211,736	2,237
Net increase (decrease) in cash and cash equivalents	18,301	(24,039)	20,644
Cash and cash equivalents at beginning of period	17,832	41,871	21,227
Cash and cash equivalents at end of period	36,133	17,832	41,871
Supplemental disclosure of cash flow information:
Cash paid for interest	20,972	8,426	3,883
Cash (refunded) paid for taxes	(91)	6	40
Equity issued for acquisitions, net	$ 0	$ 0	$ 1,130