Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net loss	$ (32,996)	$ (18,330)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	2,189	1,536
Depreciation and amortization	544	1,498
Gain on sale of fixed assets	10	(283)
Non-cash interest expense	109	0
Change in fair value of contingent consideration liability	2,600	800
Changes in assets and liabilities:
Accounts receivable	2,148	(20)
Other current assets	1,026	314
Other assets	(2)
Accounts payable	557	733
Accrued expenses	(1,718)	2,845
Other current liabilities		126
Other liabilities	162	(724)
Net cash used in operating activities	(25,371)	(11,505)
Cash flows from investing activities:
Purchases of property and equipment	(240)	(2,735)
Proceeds from sale of fixed assets	37	314
Net cash used in investing activities	(203)	(2,421)
Cash flows from financing activities:
Return of estimated interest payment for noncontrolling interest	153
Proceeds from exercise of stock options	411	11
Net cash provided by financing activities	564	11
Effect of currency rate changes on cash and cash equivalents	60	(42)
Net decrease in cash and cash equivalents	(24,950)	(13,957)
Cash and cash equivalents at beginning of period	138,909	74,103
Cash and cash equivalents at end of period	$ 113,959	$ 60,146