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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Current assets    
Cash and cash equivalents $ 81,611 $ 29,627
Investments 237,203 19,472
Accounts receivable 16,837 15,266
Inventory 14,230 13,312
Prepaid expenses and other current assets 4,870 3,069
Short-term restricted cash 836 300
Total current assets 355,587 81,046
Property and equipment, net 24,899 30,070
Operating lease right-of-use assets, net 29,951 32,827
Long-term restricted cash 3,500 4,000
Other long-term assets 43 42
Total assets 413,980 147,985
Current liabilities    
Accounts payable 3,579 8,368
Accrued expenses 17,350 13,242
Deferred revenue, current 8,722 7,610
Operating lease liabilities, current 4,332 3,837
Notes payable, current   15,871
Other liabilities, current 4,519 225
Total current liabilities 38,502 49,153
Deferred revenue, non-current 1,568 1,951
Operating lease liabilities, non-current 37,667 41,964
Other liabilities, non-current 752  
Total liabilities 78,489 93,068
Commitments and contingencies
Stockholders' equity    
Preferred stock, $0.001 par value: Authorized 50,000 shares; No shares issued or outstanding
Common stock, $0.001 par value: Authorized 1,000,000 shares; issued and outstanding 192,294 and 153,119 shares at December 31, 2020 and December 31, 2019, respectively 192 153
Additional paid-in capital 1,372,083 1,120,999
Accumulated other comprehensive income 85 5
Accumulated deficit (1,036,869) (1,066,240)
Total stockholders' equity 335,491 54,917
Total liabilities and stockholders' equity $ 413,980 $ 147,985