Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details 3)

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Summary of Significant Accounting Policies (Details 3) - Contingent Royalty Obligation [Member]
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at beginning $ 1,953
Change in estimated fair value of contingent royalty obligation (27)
Balance at end $ 1,926