Annual report pursuant to Section 13 and 15(d)

Prepaid Expense and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details)

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Prepaid Expense and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses $ 8,854 $ 6,285
Reimbursement receivable 0 3,160
State tax receivable 348 347
Other current assets 0 10
Total $ 9,202 $ 9,802