Quarterly report pursuant to Section 13 or 15(d)

Derivative Contracts - Balance Sheet Component (Details)

v3.10.0.1
Derivative Contracts - Balance Sheet Component (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Common Stock options/warrants | Investments, net    
Derivatives, Fair Value [Line Items]    
Common stock options/warrants $ 1,799 $ 3,333
Forward contracts | Unrealized gains on forward contracts are recorded in Other current assets and prepaid expenses. Unrealized (losses) on forward contracts are recorded in Accrued expenses.    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value $ 23 $ (317)