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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Operating Activities    
Net loss $ (4,138,000) $ (3,592,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 120,000 153,000
Depreciation and amortization 48,000 105,000
Gain on extinguishment of redeemable convertible notes 0 (85,000)
Change in fair value of derivative liability   (875,000)
Changes in operating assets and liabilities:    
Accounts receivable (196,000) 44,000
Prepaid and other current assets (83,000) 281,000
Accounts payable 62,000 (222,000)
Accrued compensation and other accrued liabilities (26,000) (441,000)
Deferred rent (8,000) (3,000)
Deferred revenue (71,000) (109,000)
Net cash flows used in operating activities (4,292,000) (4,744,000)
Investing Activities    
Proceeds from maturities of short-term investments 6,801,000  
Purchase of investments   (3,682,000)
Change in restricted cash (19,000) (1,000)
Purchases of property and equipment (3,000) (89,000)
Net cash flows (used in) provided by investing activities 6,779,000 (3,772,000)
Financing Activities    
Release of restricted cash due to conversion and redemption of redeemable convertible notes 6,752,000 2,807,000
Payments for the redemption of redeemable convertible notes (6,752,000) (2,807,000)
Proceeds from issuance of common stock, net of issuance costs 1,782,000  
Net cash flows provided by financing activities 1,782,000  
Net (decrease) increase in cash and cash equivalents 4,269,000 (8,516,000)
Cash and cash equivalents at beginning of period 10,264,000 29,096,000
Cash and equivalents at end of period 14,533,000 20,580,000
Supplemental Disclosure of Non-Cash Investing and Financing Information:    
Unrealized Gain (Loss) on investments $ 1,000 $ 3,000