Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 40,647	$ 20,583
Short-term investments	58,690	53,453
Accounts receivable, net	18,482	22,193
Inventory	15,759	13,812
Prepaid expenses and other	5,305	3,744
Total current assets	138,883	113,785
Restricted cash	143	143
Property and equipment, net	13,644	12,158
Other assets	372	287
Total assets	153,042	126,373
Current liabilities:
Accounts payable	3,770	4,935
Accrued liabilities	11,609	12,344
Deferred revenue, current portion	17,067	19,033
Deferred rent, current portion	444	13
Lease financing obligations, current portion	0	58
Total current liabilities	32,890	36,383
Deferred revenue, net of current portion	11,322	22,664
Deferred rent and other long-term liabilities	8,669	7,655
Long-term debt and lease financing obligations, net of current portion and debt issuance costs	48,137	47,366
Total liabilities	101,018	114,068
Commitment and contingencies
Stockholders’ equity:
Preferred stock, $0.0001 par value, 15,000 shares authorized; none issued	0	0
Common stock, $0.0001 par value, 150,000 shares authorized; 25,166 and 21,528 shares issued and outstanding at June 30, 2017 and December 31, 2016, respectively	2	2
Additional paid-in capital	345,022	281,900
Accumulated other comprehensive loss	(53)	(57)
Accumulated deficit	(292,947)	(269,540)
Total stockholders’ equity	52,024	12,305
Total liabilities and stockholders’ equity	$ 153,042	$ 126,373