Stockholders' Equity and Redeemable Convertible Preferred Stock (Details 4) - Non Employee	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Number of Shares
Outstanding at beginning of year | shares	2,893
Non-employee options granted | shares
Outstanding at end of year | shares	2,893
Options vested and expected to vest | shares	2,893
Options vested and exercisable | shares	2,893
Weighted Average Exercise Price
Outstanding at beginning of year	$ 98.07
Non-employee options granted
Outstanding at end of year	$ 98.07
Options vested and expected to vest	98.07
Options vested and exercisable	$ 98.07
Aggregate Intrinsic Value
Outstanding at beginning of year | $
Non-employee options granted
Outstanding at end of year | $
Options vested and expected to vest | $
Options vested and exercisable | $
Weighted Average Remaining Contractual Life (in years)
Outstanding at beginning of year	6 years 4 months 24 days
Outstanding at end of year	5 years 4 months 24 days
Options vested and expected to vest	5 years 4 months 24 days
Options vested and exercisable	5 years 4 months 24 days