Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 28,797	$ 20,583
Short-term investments	61,051	53,453
Accounts receivable, net	18,288	22,193
Inventory	18,520	13,812
Prepaid expenses and other	6,109	3,744
Total current assets	132,765	113,785
Restricted cash	143	143
Property and equipment, net	13,867	12,158
Other assets	412	287
Total assets	147,187	126,373
Current liabilities:
Accounts payable	2,389	4,935
Accrued liabilities	20,047	12,344
Deferred revenue, current portion	16,678	19,033
Deferred rent, current portion	479	13
Lease financing obligations, current portion	0	58
Total current liabilities	39,593	36,383
Deferred revenue, net of current portion	5,407	22,664
Deferred rent and other long-term liabilities	8,584	7,655
Long-term debt and lease financing obligations, net of current portion and debt issuance costs	48,533	47,366
Total liabilities	102,117	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; 25,339 and 21,528 shares issued and outstanding at September 30, 2017 and December 31, 2016, respectively	2	2
Additional paid-in capital	349,447	281,900
Accumulated other comprehensive loss	(28)	(57)
Accumulated deficit	(304,351)	(269,540)
Total stockholders’ equity	45,070	12,305
Total liabilities and stockholders’ equity	$ 147,187	$ 126,373