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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Current assets    
Cash and cash equivalents $ 29,627 $ 18,844
Investments 19,472 83,510
Accounts receivable 15,266 8,595
Inventory 13,312 17,878
Prepaid expenses and other current assets 3,369 2,832
Total current assets 81,046 131,659
Property and equipment, net 30,070 34,073
Operating lease right-of-use assets, net 32,827  
Long-term restricted cash 4,000 4,500
Other long-term assets 42 43
Total assets 147,985 170,275
Current liabilities    
Accounts payable 8,368 6,736
Accrued expenses 13,242 12,823
Deferred revenue, current 7,610 6,537
Operating lease liabilities, current 3,837  
Notes payable, current 15,871  
Other liabilities, current 225 788
Total current liabilities 49,153 26,884
Deferred revenue, non-current 1,951 890
Operating lease liabilities, non-current 41,964  
Deferred rent, non-current   13,765
Notes payable, non-current 14,659
Financing derivative   16
Total liabilities 93,068 56,214
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 153,119 and 150,244 shares at December 31, 2019 and December 31, 2018, respectively 153 150
Additional paid-in capital 1,120,999 1,096,053
Accumulated other comprehensive income (loss) 5 (36)
Accumulated deficit (1,066,240) (982,106)
Total stockholders' equity 54,917 114,061
Total liabilities and stockholders' equity $ 147,985 $ 170,275