Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating activities:
Net loss	$ (23,966)	$ (3,298)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization of intangible assets	0	2,531
Depreciation and amortization	795	1,365
Gain on disposal of property and equipment	(5)	(35)
Income tax expense related to marketable securities	(8)	0
Stock-based compensation	5,212	3,861
Changes in operating assets and liabilities:
Accounts receivable, net	(1,757)	(4,636)
Inventories	(24)	(84)
Prepaid expenses and other current assets	(1,303)	(18)
Restricted cash	13	(883)
Other assets	(68)	38
Accounts payable	150	(1,046)
Accrued compensation	(519)	(307)
Other accrued liabilities	2,287	60
Long term lease incentive	(319)	(319)
Other long term liabilities	(60)	0
Deferred revenue	3,204	(4,252)
Net cash used in operating activities	(16,368)	(7,023)
Investing activities:
Purchase of property and equipment	(743)	(787)
Proceeds from disposal of property and equipment	5	35
Changes in restricted cash	75	4
Net cash used in investing activities	(663)	(748)
Financing activities:
Proceeds from exercises of stock options	175	939
Proceeds from issuance of common stock, net of issuance costs	23,229	0
Principal payments on capital lease obligations	(117)	0
Taxes paid related to net share settlement of equity awards	(1,670)	(1,523)
Net cash provided by (used in) financing activities	21,617	(584)
Net increase (decrease) in cash and cash equivalents	4,586	(8,355)
Cash and cash equivalents at the beginning of the period	19,240	23,273
Cash and cash equivalents at the end of the period	23,826	14,918
Supplemental disclosure of cash flow information:
Interest paid	131	12
Income taxes	32	5
Supplemental non-cash financing activities:
Equipment acquired under capital leases	$ 840	$ 0