Convertible Preferred Stock And Stockholders' Equity (Narrative) (Details)					1 Months Ended		3 Months Ended		12 Months Ended
	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 ($)	Mar. 31, 2017 USD ($) $ / shares item shares	Mar. 31, 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									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
Proceeds from issuance of stock, net of issuance costs							$ 9,336	$ 7,392
Increase in number of shares authorized for issuance under the Plan | shares		1,500,000	1,000,000	1,000,000
Total compensation cost not yet recognized							$ 1,100,000
Weighted average amortization period of total compensation cost not yet recognized							4 years
Remaining shares available for issuance | shares							1,540,856
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, net of issuance costs									$ 0
Warrants [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Exercise price of warrants | $ / shares							$ 0.83
Restricted Stock Units [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Restricted shares outstanding | shares							685,612		1,167,099
Healthcare Royalty Partners Debt [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Payments of debt					$ 13,000,000