Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 65,126	$ 48,668
Restricted cash	163	187
Short-term investments	588,446	688,606
Accounts receivable, net of allowance of $2,970 in 2021 and $3,080 in 2020	87,562	78,565
Inventory	23,676	20,031
Prepaid expenses and other current assets, net	26,430	26,606
Total current assets	791,403	862,663
Property and equipment, net	40,177	33,348
Operating lease right-of-use assets	49,526	21,399
Other assets	12,406	14,743
Total assets	893,512	932,153
Current liabilities:
Accounts payable	4,682	8,096
Accrued compensation	25,870	30,371
Other accrued liabilities	77,296	60,407
Deferred revenue, current portion	9,069	50,125
Short-term debt financing	50,052	50,054
Total current liabilities	166,969	199,053
Long-term debt financing	279,471	202,493
Deferred revenue, long-term portion	23,816	22,805
Operating lease liabilities, long-term portion	50,811	21,246
Other long-term liabilities		320
Total liabilities	521,067	445,917
Commitments and contingencies (Note 8)
Stockholders' equity:
Common stock, $0.0001 par value: 750,000 shares authorized at both March 31, 2021 and December 31, 2020, respectively; 87,430 and 86,223 shares issued and outstanding at March 31, 2021 and December 31, 2020, respectively	9	9
Additional paid in capital	1,356,212	1,411,286
Accumulated deficit	(986,973)	(929,318)
Accumulated other comprehensive gain	3,197	4,259
Total stockholders' equity	372,445	486,236
Total liabilities and stockholders' equity	$ 893,512	$ 932,153