Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 48,668	$ 61,926
Restricted cash	187	55
Short-term investments	688,606	379,065
Accounts receivable, net of allowance of $3,080 in 2020 and $2,919 in 2019	78,565	53,351
Inventory	20,031	12,394
Prepaid expenses and other current assets, net	26,606	16,376
Total current assets	862,663	523,167
Property and equipment, net	33,348	23,283
Operating lease right-of-use assets	21,399	23,730
Other assets	14,743	12,476
Total assets	932,153	582,656
Current liabilities:
Accounts payable	8,096	8,604
Accrued compensation	30,371	16,088
Other accrued liabilities	60,407	49,043
Deferred revenue, current portion	50,125	56,016
Short-term debt financing	50,054	50,123
Total current liabilities	199,053	179,874
Long-term debt financing	202,493	73,656
Deferred revenue, long-term portion	22,805	23,808
Operating lease liabilities, long-term portion	21,246	26,297
Other long-term liabilities	320	310
Total liabilities	445,917	303,945
Commitments and contingencies (Note 8)
Stockholders' equity:
Common stock, $0.0001 par value: 750,000 shares authorized at December 31, 2020 and 2019, respectively; 86,223 and 78,005 shares issued and outstanding at December 31, 2020 and 2019, respectively	9	8
Additional paid in capital	1,411,286	976,955
Accumulated deficit	(929,318)	(699,171)
Accumulated other comprehensive gain	4,259	919
Total stockholders' equity	486,236	278,711
Total liabilities and stockholders' equity	$ 932,153	$ 582,656