Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Operating Activities
Net loss	$ (15,414)	$ (12,913)
Adjustments to reconcile net loss to net cash and cash equivalents used in operating activities:
Depreciation	532	565
Amortization of intangible assets	1,636	1,817
Amortization of debt discount and debt issuance costs	31	52
Stock-based compensation	2,139	1,428
Deferred tax benefit	(858)	(2,645)
Change in fair value of contingent consideration	1,227	856
Changes in operating assets and liabilities, net of effect of acquisition:
Accounts receivable	(753)
Interest receivable	2	(6)
Inventories	(320)	(1,735)
Other current and long term assets	(251)	(132)
Accounts payable	(759)	(1,391)
Accrued expenses	(1,161)	(765)
Net cash and cash equivalents used in operating activities	(13,949)	(14,869)
Investing Activities
Purchase of property and equipment	(501)	(153)
Net cash and cash equivalents (used in) provided by investing activities	(501)	(153)
Financing Activities
Payment of debt	(1,966)	(1,219)
Proceeds from issuance of common stock, net of issuance costs	5,304	31,391
Taxes paid related to net share settlement of vesting of restricted stock units		(130)
Proceeds from exercise of stock options and warrants		8
Net cash and cash equivalents provided by financing activities	3,338	30,050
Effect of exchange rate changes on cash and cash equivalents	40	34
Net (decrease) increase in cash, cash equivalents and restricted cash	(11,072)	15,062
Cash, cash equivalents and restricted cash, beginning of period	34,590	38,449	$ 38,449
Cash, cash equivalents and restricted cash, end of period	23,518	53,511	$ 34,590
Supplemental Disclosure for Cash Flow Information
Interest paid	233	373
Supplemental Schedule of Noncash Investing Activities
Transfer of inventory to property and equipment		$ 1,823
Issuance of common stock as contingent consideration	$ 5,227