Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net loss	$ (16,360)	$ (12,673)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	256	751
Stock-based compensation expense	603	576
Gain on sale of fixed assets	(15)	(112)
Paid in-kind interest	(13)	0
Non-cash interest expense	61	0
Change in fair value of contingent consideration liability	1,900	200
Changes in assets and liabilities:
Accounts receivable	2,767	1,204
Other current assets	638	448
Other assets	(1)
Accounts payable	402	1,156
Accrued expenses	(3,066)	513
Other current liabilities	0	(59)
Other liabilities	81	29
Net cash used in operating activities	(12,747)	(7,967)
Cash flows from investing activities:
Purchases of property and equipment	(145)	(607)
Proceeds from sale of fixed assets	32	113
Net cash used in investing activities	(113)	(494)
Cash flows from financing activities:
Proceeds from exercise of stock options	232
Net cash provided by financing activities	232
Effect of currency rate changes on cash and cash equivalents	25	33
Net decrease in cash and cash equivalents	(12,603)	(8,428)
Cash and cash equivalents at beginning of period	138,909	74,103
Cash and cash equivalents at end of period	$ 126,306	$ 65,675