Convertible Preferred Stock And Stockholders' Equity (Narrative) (Details)		1 Months Ended			12 Months Ended
	Sep. 29, 2016 USD ($) $ / shares shares	Sep. 30, 2016 USD ($)	Jun. 30, 2014 shares	May 31, 2014 USD ($)	Dec. 31, 2016 USD ($) $ / shares item shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2009 USD ($)
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
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
Adjustment for forfeiture rate					200,000
Total compensation cost not yet recognized					1,800,000
Estimated forfeitures					$ 300,000
Weighted average amortization period of total compensation cost not yet recognized					1 year 6 months
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
2009 Employee Stock Purchase Plan [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Exercise price as percentage of fair value							95.00%
Increase in number of shares authorized for issuance under the Plan | shares			250,000
Eligible employees new purchase period					3 months
Maximum percentage of compensation eligible employees can use to purchase common stock							15.00%
Compensation amount eligible employees can use to purchase common stock, maximum							$ 25,000
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent							95.00%
Remaining shares available for issuance | shares					192,290
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%
Stock Options And Stock Appreciation Rights [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Options expiration term					10 years
Weighted average remaining contractual life					7 years 22 days
Options and stock appreciation rights vested and exercisable | shares					429,029
Options and stock appreciation rights weighted average exercise price | $ / shares					$ 12.15
Options and stock appreciation rights weighted average remaining term					6 years 7 months 21 days
Options and stock appreciation rights intrinsic value					$ 0
Proceeds from options and stock appreciation rights exercised					$ 0	$ 0
Weighted average grant date fair value of options and stock appreciation rights granted | $ / shares					$ 1.55
Share price | $ / shares					$ 0.65
Stock Options And Stock Appreciation Rights [Member] | Tranche One [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Options vesting percentage					25.00%
Stock Options And Stock Appreciation Rights [Member] | Tranche Two [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Options vesting percentage					2.0833%
Options vesting period					3 years
Stock Options And Stock Appreciation Rights [Member] | Director [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Options expiration term					10 years
Stock Options And Stock Appreciation Rights [Member] | Director [Member] | Tranche One [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Options vesting period					2 years
Stock Options And Stock Appreciation Rights [Member] | Director [Member] | Tranche Two [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Options vesting period					1 year
Stock Options And Stock Appreciation Rights [Member] | Minimum [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Exercise price as percentage of fair value					100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent					100.00%
Stock Options And Stock Appreciation Rights [Member] | Minimum [Member] | Director [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Exercise price as percentage of fair value					100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent					100.00%
Warrants [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Exercise price of warrants | $ / shares					$ 0.84
Stock Appreciation Rights [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Options expiration term					10 years
Stock Appreciation Rights [Member] | Tranche One [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Options vesting percentage					25.00%
Stock Appreciation Rights [Member] | Tranche Two [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Options vesting percentage					2.0833%
Options vesting period					3 years
Restricted Stock [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Options vesting period					3 years
Restricted shares outstanding | shares					0
Restricted Stock Units [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Options vesting period					4 years
Intrinsic value of restricted awards outstanding					$ 800,000
Intrinsic value of restricted awards vested					$ 300,000
Restricted shares outstanding | shares					1,167,099	752,008
Share price | $ / shares					$ 0.65
Healthcare Royalty Partners Debt [Member]
Shareholders' Equity and Share-based Payments [Line Items]
Payments of debt		$ 13,000,000			$ 13,000,000