CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net loss	$ (12,673)	$ (10,254)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	751	132
Stock-based compensation expense	576	757
Gain on sale of fixed assets	(112)	(2)
Change in value of contingent consideration	200	300
Changes in assets and liabilities:
Accounts receivable	1,204	(43)
Other current assets	448	(491)
Accounts payable	1,156	40
Accrued expenses	513	(1,309)
Other current liabilities	(59)	0
Other liabilities	29	(12)
Net cash used in operating activities	(7,967)	(10,882)
Cash flows from investing activities:
Purchases of property and equipment	(607)	(53)
Proceeds from sale of fixed assets	113	2
Net cash used in investing activities	(494)	(51)
Cash flows from financing activities:
Proceeds from exercise of stock options	0	61
Net cash provided by financing activities	0	61
Effect of currency rate changes on cash and cash equivalents	33	0
Net decrease in cash and cash equivalents	(8,428)	(10,872)
Cash and cash equivalents at beginning of period	74,103	119,302
Cash and cash equivalents at end of period	$ 65,675	$ 108,430