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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash Flows from Operating Activities:    
Net (loss) income $ (1,494) $ 405
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:    
Depreciation 20 25
Provision for sales returns 0 49
Non-cash share-based compensation 62 117
Amortization of debt discount and deferred debt issue costs 17 30
Amortization of intangible asset 52 52
Change in assets and liabilities:    
Accounts receivable 0 17
Collaboration revenue receivable 0 43
Royalty receivable (121) (2)
Inventory 0 103
Prepaid expenses and other current assets 159 (33)
Accounts payable 413 132
Accrued expenses (122) 337
Accrued interest 45 74
Other current liabilities 4 0
Sales returns liability 0 (51)
Net cash (used in) provided by operating activities (965) 1,298
Cash Flows from Investing Activities:    
Proceeds from transfer of equipment to licensee 0 103
Proceeds from transfer of inventory to licensee 0 206
Net cash provided by investing activities 0 309
Cash Flows from Financing Activities:    
Proceeds from distribution of restricted stock units 2 0
Principal payments on loan maturing December 1, 2018 (483) (445)
Net cash (used in) financing activities (481) (445)
Net (decrease) increase in cash, cash equivalents, and restricted cash (1,446) 1,162
Cash, cash equivalents, and restricted cash at beginning of period 2,220 5,181
Cash, cash equivalents, and restricted cash at end of period 774 6,343
Reconciliation of cash, cash equivalents, and restricted cash    
Cash and cash equivalents 774 3,843
Restricted cash equivalents 0 2,500
Total cash, cash equivalents and restricted cash show in the consolidated statements of cash flows $ 2,220 $ 5,181