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Condensed Consolidated Balance Sheets - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 52,993,000 $ 16,631,000
Accounts receivable 1,073,000 865,000
Prepaid expenses and other current assets 740,000 1,077,000
Inventories 101,000 30,000
Total current assets 54,907,000 18,603,000
Property and equipment, net 546,000 583,000
Right-of-use assets 376,000 406,000
Other assets   13,000
Total assets 55,829,000 19,605,000
Current liabilities:    
Accounts payable 1,436,000 1,103,000
Accrued liabilities 3,900,000 3,618,000
Current portion long-term debt 199,000 645,000
Short-term debt 204,000 611,000
Lease liability 52,000 23,000
Total current liabilities 5,791,000 6,000,000
Non-current liabilities:    
Long-term debt 2,818,000 3,477,000
Lease liability 382,000 409,000
Total liabilities 8,991,000 9,886,000
Commitments and contingencies (Note 3)
Stockholders' equity:    
Common stock, par value $0.001 per share, 150,000,000 shares authorized at June 30, 2021 and December 31, 2020; 112,058,034 and 104,619,876 shares issued and outstanding at June 30, 2021 and December 31, 2020, respectively 112,000 105,000
Additional paid-in capital 499,786,000 449,680,000
Accumulated deficit (453,060,000) (440,066,000)
Total stockholders' equity 46,838,000 9,719,000
Total liabilities and stockholders' equity $ 55,829,000 $ 19,605,000