Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 419,311	$ 494,766
Short-term marketable securities	18,085	66,126
Accounts receivable, net	19,544	17,500
Inventories	47,991	40,223
Prepaid expenses and other current assets	19,928	13,548
Total current assets	524,859	632,163
Property and equipment, net	36,775	37,882
Operating lease right-of-use assets	49,421	50,722
Restricted cash	2,395	2,436
Other assets, noncurrent	1,522	799
Total assets	614,972	724,002
Current liabilities:
Accounts payable	9,198	19,078
Accrued liabilities	38,904	31,133
Accrued compensation	19,330	23,985
Operating lease liabilities, current	5,243	4,836
Total current liabilities	72,675	79,032
Long-term debt	149,268	148,815
Operating lease liabilities, noncurrent	76,441	79,176
Other liabilities, noncurrent	822	822
Total liabilities	299,206	307,845
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.001 par value, 5,000,000 shares authorized as of June 30, 2021 (unaudited) and December 31, 2020; no shares issued and outstanding
Common stock, $0.001 par value, 150,000,000 shares authorized as of June 30, 2021 (unaudited) and December 31, 2020, respectively; 62,379,118 and 61,898,090 shares issued and outstanding as of June 30, 2021 (unaudited) and December 31, 2020, respectively	62	62
Additional paid-in capital	1,446,393	1,402,262
Accumulated other comprehensive loss	302	302
Accumulated deficit	(1,130,991)	(986,469)
Total stockholders' equity	315,766	416,157
Total liabilities and stockholders' equity	$ 614,972	$ 724,002