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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Current assets    
Cash and cash equivalents $ 30,358 $ 18,844
Investments 36,486 83,510
Accounts receivable 12,123 8,595
Inventory 17,404 17,878
Prepaid expenses and other current assets 2,538 2,832
Total current assets 98,909 131,659
Property and equipment, net 33,457 34,073
Operating lease right-of-use assets, net 34,175  
Long-term restricted cash 4,000 4,500
Other long-term assets 41 43
Total assets 170,582 170,275
Current liabilities    
Accounts payable 8,011 6,736
Accrued expenses 14,107 12,823
Deferred service revenue, current 6,707 6,537
Operating lease liabilities, current 3,631  
Notes payable, current 15,233  
Other liabilities, current 1,764 788
Total current liabilities 49,453 26,884
Deferred service revenue, non-current 1,454 890
Operating lease liabilities, non-current 43,921  
Deferred rent, non-current   13,765
Notes payable, non-current   14,659
Financing derivative   16
Total liabilities 94,828 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 152,959 and 150,244 shares at June 30, 2019 and December 31, 2018, respectively 153 150
Additional paid-in-capital 1,112,610 1,096,053
Accumulated other comprehensive income (loss) 17 (36)
Accumulated deficit (1,037,026) (982,106)
Total stockholders' equity 75,754 114,061
Total liabilities and stockholders' equity $ 170,582 $ 170,275