Financial Instruments - Schedule of Fair Value On a Recurring and Non-recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Marketable securities	$ 999
Notes receivable - current	1,500
Total current assets recorded at fair value	2,499
Restricted cash	3,964	3,964
Notes receivable - non-current	2,176
Total non-current assets recorded at fair value	6,117	3,964
Fair Value, Inputs, Level 1 [Member]
Marketable securities	999
Notes receivable - current
Total current assets recorded at fair value	999
Restricted cash	3,964	3,964
Notes receivable - non-current
Total non-current assets recorded at fair value	3,941	3,964
Fair Value, Inputs, Level 2 [Member]
Marketable securities
Notes receivable - current	1,500
Total current assets recorded at fair value	1,500
Restricted cash
Notes receivable - non-current	2,176
Total non-current assets recorded at fair value	2,176
Fair Value, Inputs, Level 3 [Member]
Marketable securities
Notes receivable - current
Total current assets recorded at fair value
Restricted cash
Notes receivable - non-current
Total non-current assets recorded at fair value