Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 61,926	$ 46,407
Restricted cash, current portion	55	4,597
Short-term investments	379,065	107,461
Accounts receivable, net of allowance of $2,919 in 2019 and $1,788 in 2018	53,351	62,223
Inventory	12,394	13,633
Prepaid expenses and other current assets	16,376	6,197
Total current assets	523,167	240,518
Property and equipment, net	23,283	24,336
Operating lease right-of-use assets	23,730
Other assets	12,476	3,317
Total assets	582,656	268,171
Current liabilities:
Accounts payable	8,604	14,587
Accrued compensation	16,088	12,668
Other accrued liabilities	49,043	32,442
Deferred revenue, current portion	56,016	4,131
Short-term debt financing	50,123	50,153
Total current liabilities	179,874	113,981
Long-term debt financing	73,656	73,357
Deferred rent, net of current portion		8,613
Deferred revenue, long-term portion	23,808	40,058
Operating lease liabilities, long-term portion	26,297
Other long-term liabilities	310
Total liabilities	303,945	236,009
Commitments and contingencies (Note 8)
Stockholders' equity:
Preferred stock, $0.0001 par value: 50,000 shares authorized; no shares issued and outstanding at December 31, 2019 and 2018, respectively
Common stock, $0.0001 par value: 750,000 shares authorized at December 31, 2019 and 2018, respectively; 78,005 and 62,083 shares issued and outstanding at December 31, 2019 and 2018, respectively	8	7
Additional paid in capital	976,955	607,236
Accumulated deficit	(699,171)	(574,529)
Accumulated other comprehensive income (loss)	919	(552)
Total stockholders' equity	278,711	32,162
Total liabilities and stockholders' equity	$ 582,656	$ 268,171