Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 51,609	$ 46,407
Restricted cash	55	4,597
Short-term investments	186,700	107,461
Accounts receivable, net of allowance of $2,227 in 2019 and $1,788 in 2018	58,905	62,223
Inventory	12,514	13,633
Prepaid expenses and other current assets	13,954	6,197
Total current assets	323,737	240,518
Property and equipment, net	19,027	24,336
Operating lease right-of-use assets	24,807
Other assets	12,679	3,317
Total assets	380,250	268,171
Current liabilities:
Accounts payable	9,236	14,587
Accrued compensation	14,238	12,668
Other accrued liabilities	38,702	32,442
Deferred revenue, current portion	25,667	4,131
Short-term debt financing	50,131	50,153
Total current liabilities	137,974	113,981
Long-term debt financing	73,583	73,357
Deferred rent, net of current portion		8,613
Deferred revenue, long-term portion	56,174	40,058
Operating lease liabilities, long-term portion	27,825
Total liabilities	295,556	236,009
Commitments and contingencies (Note 8)
Stockholders' equity:
Common stock, $0.0001 par value: 750,000 shares authorized at both September 30, 2019 and December 31, 2018, respectively; 70,850 and 62,083 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	7	7
Additional paid in capital	747,817	607,236
Accumulated deficit	(663,988)	(574,529)
Accumulated other comprehensive income (loss)	858	(552)
Total stockholders' equity	84,694	32,162
Total liabilities and stockholders' equity	$ 380,250	$ 268,171