Convertible Preferred Stock And Stockholders' Equity (Narrative) (Details)						1 Months Ended		6 Months Ended		12 Months Ended
	May 23, 2017 shares	Sep. 29, 2016 USD ($) shares	May 24, 2016 shares	Jun. 10, 2014 shares	Jun. 05, 2013 shares	Sep. 30, 2016 USD ($)	May 31, 2014 USD ($)	Jun. 30, 2017 USD ($) $ / shares item shares	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) $ / shares shares
Shareholders' Equity and Share-based Payments [Line Items]
Votes per share | item								1
Dividends declared								$ 0
Dividends paid								$ 0
Proceeds from preferred stock and warrants issued, gross		$ 24,000,000
Preferred stock, shares issued | shares		24,000
Preferred stock, par value | $ / shares								$ 0.001		$ 0.001
Preferred Stock, Liquidation Preference, Value								$ 1,000
Common stock issuable from warrants | shares		36,923,078
Proceeds from preferred stocks and warrants, net										$ 23,000,000
Payments of debt									$ 23,709	13,000,000
Preferred stock dividend rate								6.00%
Preferred stock, conversion price | $ / shares								$ 0.65
Preferred stock redemption, triggering event, Percent of common stock sold threshold								50.00%
Preferred stock, Accretion of dicount										$ 6,100,000
Exercise price of warrants | $ / shares								$ 0.70
Warrant term								180 days
Increase in number of shares authorized for issuance under the Plan | shares	4,000,000		1,500,000	1,000,000	1,000,000
Total compensation cost not yet recognized								$ 900,000
Weighted average amortization period of total compensation cost not yet recognized								4 years
Remaining shares available for issuance | shares								5,544,098
Convertible Preferred Stock [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Shares converted | shares										100
Common Stock [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Shares issued in conversion | shares										155,439
Sales Agreement [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Aggregate gross sales price							$ 18,000,000
Commission percentage of gross proceeds							3.00%
Proceeds from issuance of stock										$ 0
Warrants [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Exercise price of warrants | $ / shares								$ 0.82
Restricted Stock Units [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Restricted shares outstanding | shares								636,862		1,167,099
Healthcare Royalty Partners Debt [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Payments of debt						$ 13,000,000