Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 34,535	$ 12,620
Restricted cash, current portion	4,222	59
Short-term investments	130,891	106,247
Accounts receivable, net of allowance of $1,980 in 2018 and $2,000 in 2017	60,397	44,089
Inventory	12,244	8,998
Prepaid expenses and other current assets	6,399	8,612
Total current assets	248,688	180,625
Property and equipment, net	24,833	29,667
Restricted cash, long term portion	342	342
Other assets	3,446	3,979
Total assets	277,309	214,613
Current liabilities:
Accounts payable	9,884	8,529
Accrued compensation	9,587	9,599
Other accrued liabilities	31,067	33,257
Deferred revenue, current portion	1,156	1,420
Short-term debt financing	50,135	50,112
Warrants		2,644
Total current liabilities	101,829	105,561
Long-term debt financing	73,284	73,065
Deferred rent, net of current portion	8,775	9,241
Deferred revenue, long-term portion	36,850
Other long-term liabilities		1,329
Total liabilities	220,738	189,196
Commitments and contingencies (Note 7)
Stockholders' equity:
Common stock, $0.0001 par value: 750,000 shares authorized at both September 30, 2018 and December 31, 2017, respectively; 61,673 and 54,040 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively	7	6
Additional paid in capital	600,146	472,552
Accumulated deficit	(542,688)	(446,375)
Accumulated other comprehensive loss	(894)	(766)
Total stockholders' equity	56,571	25,417
Total liabilities and stockholders' equity	$ 277,309	$ 214,613