Fair Value Measurements (Details 5) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financial Assets
Cash and cash equivalents	$ 32,182	$ 47,287	$ 58,728
Cash and cash equivalents at fair value	32,182	47,287
Finance receivables	126,366	99,346
Finance receivables at fair value	126,366	99,346
Marketable investments	2,621	5,286
Marketable investments at fair value	2,621	5,286
Warrant assets	1,013	1,900
Warrant assets at fair value	1,013	1,900
Financial Liabilities
Warrant liability	189	259
Gross liability at fair value	189	259
Fair Value, Inputs, Level 1 [Member]
Financial Assets
Cash and cash equivalents at fair value	32,182	47,287
Marketable investments at fair value		2,429
Fair Value, Inputs, Level 3 [Member]
Financial Assets
Cash and cash equivalents
Finance receivables at fair value	126,366	99,346
Marketable investments at fair value	2,621	2,857
Warrant assets at fair value	1,013	1,900
Financial Liabilities
Gross liability at fair value	$ 189	$ 259