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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Current Assets:    
Cash and cash equivalents $ 17,894 $ 20,046
Accounts receivable 276 45
Due from related parties 147 112
Unbilled receivables 288 420
Inventory 375 586
Prepaid expenses and other current assets 1,443 756
Total current assets 20,423 21,965
Restricted cash 619 619
Property and equipment, net 908 456
Other assets 170 95
Total assets 22,120 23,135
Current Liabilities:    
Accounts payable 448 333
Accrued expenses 3,590 3,709
Deferred revenue 154 147
Total current liabilities 4,192 4,189
Other long-term liabilities 150 150
Total liabilities $ 4,342 $ 4,339
Commitments and contingencies (Note 9)
Stockholders’ Equity:    
Preferred stock ($0.01 par value per share); 5,000,000 shares authorized; no shares issued or outstanding $ 0 $ 0
Common stock ($0.01 par value per share); 250,000,000 shares authorized at September 30, 2015 and December 31, 2014; 26,981,214 and 22,530,322 shares issued and outstanding at September 30, 2015 and December 31, 2014, respectively 270 225
Additional paid-in capital 337,416 320,707
Accumulated other comprehensive loss (72) (64)
Accumulated deficit (319,836) (302,072)
Total stockholders’ equity 17,778 18,796
Total liabilities and stockholders’ equity $ 22,120 $ 23,135