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Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Current Assets:    
Cash and cash equivalents $ 19,973 $ 14,684 [1]
Short-term investments 23,050 51,453 [1]
Accounts receivable, net 1,128 432 [1]
Inventories, net 1,982 3,295 [1]
Prepaid expenses and other current assets 1,663 1,824 [1]
Total current assets 47,796 71,688 [1]
Operating lease right-of-use assets 3,291 3,928 [1]
Property and equipment, net 14,372 14,552 [1]
Other assets 720 1,188 [1]
Total Assets 66,179 91,356 [1]
Current Liabilities:    
Accounts payable 1,998 1,720 [1]
Accrued liabilities 4,290 5,528 [1]
Long-term debt, current portion 8,720 4,630 [1]
Deferred revenue, current portion 196 411 [1]
Operating lease liabilities, current portion 1,131 970 [1]
Liability related to the sale of future royalties, current portion 225 352 [1]
Total current liabilities 16,560 13,611 [1]
Long-term debt, net of current portion 14,993 20,517 [1]
Deferred revenue, net of current portion 0 2,833 [1]
Operating lease liabilities, net of current portion 2,806 3,640 [1]
Liability related to the sale of future royalties, net of current portion 89,114 91,683 [1]
Other long-term liabilities 559 490 [1]
Total liabilities 124,032 132,774 [1]
Commitments and Contingencies
Stockholders’ Deficit:    
Common stock, $0.001 par value—200,000,000 shares authorized as of September 30, 2020 and December 31, 2019; 90,477,613 and 79,573,101 shares issued and outstanding as of September 30, 2020 and December 31, 2019 90 79 [1]
Additional paid-in capital 371,624 356,609 [1]
Accumulated deficit (429,567) (398,106) [1]
Total stockholders’ deficit (57,853) (41,418) [1]
Total Liabilities and Stockholders’ Deficit $ 66,179 $ 91,356 [1]
[1] The condensed consolidated balance sheet as of December 31, 2019 has been derived from the audited financial statements as of that date included in the Company's Annual Report on Form 10-K for the year ended December 31, 2019.