CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating activities:
Net income (loss)	$ (2,584)	$ 69
Adjustment to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	1,483	839
Amortization of debt issuance costs	84	64
Revaluation of warrant liability	(91)	(71)
Stock-based compensation	662	600
Changes in operating assets and liabilities:
Accounts receivable	(2,734)	(3,313)
Inventory	(7,391)	(4,390)
Prepaid expenses and other assets	(621)	(166)
Deferred revenue	(53)	105
Deferred rent	44	(375)
Accounts payable	4,291	2,821
Accrued compensation and benefits	(235)	77
Accrued liabilities	829	53
Net cash provided by (used in) operating activities	(6,316)	(3,687)
Investing activities:
Purchases of property and equipment	(1,048)	(436)
Net cash used in investing activities	(1,048)	(436)
Financing activities:
Payments on capital lease financing obligations	(622)	(335)
Payments on term loans	(45,733)	(598)
Proceeds from term loans	57,934	4,009
Proceeds from issuance of common stock upon exercise of stock options	358	282
Proceeds from issuance of preferred stock upon exercise of warrants	55
Payments of deferred offering costs	(317)
Net cash provided by (used in) financing activities	11,675	3,358
Net increase (decrease) in cash and cash equivalents	4,311	(765)
Cash and cash equivalents
Beginning of period	10,121	6,939
End of period	$ 14,432	$ 6,174