Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Net (loss) income	$ (48,348)	$ 17,952
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	3,124	1,958
Depreciation and amortization	832	1,860
Gain on sale of fixed assets	10	(291)
Non-cash interest expense	172	0
Change in fair value of contingent consideration liability	3,300	1,400
Changes in assets and liabilities:
Accounts receivable	2,245	(403)
Other current assets	2,644	1,875
Other assets	(4)	(1,027)
Accounts payable	527	770
Accrued expenses	(5,732)	3,498
Other current liabilities		(159)
Other liabilities	242	(176)
Net cash (used in) provided by operating activities	(40,988)	27,257
Cash flows from investing activities:
Purchases of property and equipment	(263)	(3,261)
Proceeds from sale of fixed assets	37	341
Net cash used in investing activities	(226)	(2,920)
Cash flows from financing activities:
Return of estimated interest payment for noncontrolling interest	21
Proceeds from exercise of stock options	470	510
Net cash provided by financing activities	491	510
Effect of currency rate changes on cash and cash equivalents	93	(56)
Net (decrease) increase in cash and cash equivalents	(40,630)	24,791
Cash and cash equivalents at beginning of period	138,909	74,103
Cash and cash equivalents at end of period	$ 98,279	$ 98,894