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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Current assets    
Cash and cash equivalents $ 68,862 $ 29,627
Investments 73,729 19,472
Accounts receivable 7,325 15,266
Inventory 16,124 13,312
Prepaid expenses and other current assets 3,490 3,369
Total current assets 169,530 81,046
Property and equipment, net 29,076 30,070
Operating lease right-of-use assets, net 32,118 32,827
Long-term restricted cash 4,000 4,000
Other long-term assets 40 42
Total assets 234,764 147,985
Current liabilities    
Accounts payable 4,223 8,368
Accrued expenses 17,963 13,242
Deferred revenue, current 7,107 7,610
Operating lease liabilities, current 3,967 3,837
Notes payable, current   15,871
Deferred gain from Reverse Termination Fee 98,000  
Other liabilities, current 714 225
Total current liabilities 131,974 49,153
Deferred revenue, non-current 1,484 1,951
Operating lease liabilities, non-current 40,903 41,964
Total liabilities 174,361 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 153,953 shares and 153,119 shares at March 31, 2020 and December 31, 2019, respectively 154 153
Additional paid-in capital 1,125,229 1,120,999
Accumulated other comprehensive income 30 5
Accumulated deficit (1,065,010) (1,066,240)
Total stockholders' equity 60,403 54,917
Total liabilities and stockholders' equity $ 234,764 $ 147,985