Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 196,192	$ 87,176
Restricted cash, current portion	186	503
Short-term investments	26,389
Accounts receivable, net of allowance of $784 in 2015 and $527 in 2014	5,820	5,942
Inventory	12,724	11,542
Prepaid expenses and other current assets	4,982	1,314
Total current assets	246,293	106,477
Property and equipment, net	13,992	14,574
Restricted cash, long term portion	1,428	808
Other assets	654	1,764
Total assets	262,367	123,623
Current liabilities:
Accounts payable	6,067	8,867
Accrued compensation	7,627	5,980
Other accrued liabilities	17,488	10,341
Deferred revenue	105	112
Equipment loan, current portion		2,340
Warrants	3,741	2,232
Total current liabilities	35,028	29,872
Equipment loan, long term portion		3,510
Senior secured term loan	21,276	20,964
Total long-term liabilities	21,276	24,474
Total liabilities	$ 56,304	$ 54,346
Commitments and contingencies (Note 6)
Convertible preferred stock issuable in series, $0.0001 par value: 50,000 and 51,233 shares authorized as of September 30, 2015 and December 31, 2014, respectively, 0 and 31,397 shares issued and outstanding as of September 30, 2015 and December 31, 2014, respectively; aggregate liquidation preference of $0 and $133,757 as of September 30, 2015 and December 31, 2014, respectively		$ 240,612
Stockholders’ deficit:
Common stock, $0.0001 par value: 750,000 and 82,000 shares authorized at September 30, 2015 and December 31, 2014, respectively, 49,951 and 6,879 shares issued and outstanding at September 30, 2015 and December 31, 2014, respectively	$ 5	1
Additional paid in capital	433,145	8,664
Notes receivable from officers		(192)
Accumulated other comprehensive income	36
Accumulated deficit	(227,123)	(179,808)
Total stockholders’ equity (deficit)	206,063	(171,335)
Total liabilities, convertible preferred stock, and stockholders’ equity (deficit)	$ 262,367	$ 123,623