Commitments and Contingencies - Austin Office Lease (Details) - Austin Office Lease [Member] - Office ft² in Thousands, $ in Millions	1 Months Ended
	May 31, 2016 USD ($) ft² extension
Operating Leased Assets [Line Items]
Area of office building leased (in square feet) | ft²	38
Term of lease	10 years
Number of lease extensions available | extension	2
Period of time for lease extensions	5 years
Expected cumulative base rent over initial lease term | $	$ 9.9