Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Statement of Cash Flows [Abstract]
Net loss	$ (14,792)	$ (22,930)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation	2,249	2,098
Depreciation and amortization expense	12,505	9,680
Loss on extinguishment of debt	11,429	0
Non-cash interest expense	3,100	3,474
Loss on disposal of assets	1,395	0
Deferred taxes	(2,751)	3,062
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable, net	(20,404)	11,513
Unbilled receivables, net	(26,376)	5,427
Inventories, net	(1,561)	(3,639)
Prepaid expenses	(818)	(532)
Accounts payable	(11,162)	6,036
Accrued expenses	(6,403)	5,530
Other non-current assets/liabilities	(624)	(1,534)
Net cash used in operating activities	(13,405)	(4,841)
Cash flows from investing activities:
Acquisitions, net of cash acquired	0	236,091
Purchases of property and equipment	(2,055)	(3,679)
Net cash used in investing activities	(2,055)	(239,770)
Cash flows from financing activities:
Proceeds from issuance of term note	290,000	135,000
Principal payments of term loan	(131,625)	0
Principal payments of convertible senior notes	(126,892)	0
Settlement of capped call transactions	2,118	0
Payment of debt extinguishment costs	7,482	4,689
Payment of debt extinguishment costs	(711)	0
Proceeds from revolver	25,000	10,000
Repayment of revolver	25,000	0
Proceeds from stock issuance, net	0	84,586
Proceeds from option exercises, net	155	109
Net cash provided by financing activities	25,563	225,006
Net increase (decrease) in cash and cash equivalents	10,103	(19,605)
Cash and cash equivalents at beginning of period	17,832	41,871
Cash and cash equivalents at end of period	27,935
Supplemental disclosure of cash flow information:
Cash paid for interest	8,964	4,007
Cash paid for taxes	$ 88	$ 16