Commitments and Contingencies (Details) ft² in Thousands, $ in Millions		3 Months Ended
	Jan. 16, 2015 USD ($) ft²	Mar. 31, 2017 ft²	Dec. 31, 2016 ft²
Schedule Of Operating Leases Square Footage [Line Items]
Lease square footage	222
Annual rent expense | $	$ 2.9
Scenario, Forecast [Member]
Schedule Of Operating Leases Square Footage [Line Items]
Lease square footage		55	167