Commitments and Contingencies - Employment Agreements (Details) $ in Thousands				9 Months Ended	12 Months Ended
	Jun. 01, 2015	Oct. 03, 2014	Jun. 01, 2005	Sep. 30, 2017 USD ($) employee	Dec. 31, 2016 USD ($)
Mr. Rami S. Ramadan | Employment agreements
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Perpetually renewable employment term				1 year
Annual compensation pursuant to the employment agreement | $				$ 563	$ 450
Number of days prior to a Change of Control				120 days
Number of months after a Change of Control				24 months
Period after termination where the Company will pay certain terms and conditions				2 years
Director of Development | Employment agreements
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Perpetually renewable employment term			3 years
Notice period required to notify employee that employment agreement will not be renewed			60 days
Automatic renewal period of employment agreement			3 years
Severance payment if employment agreement is not renewed	3 months
Change of Control agreements
Severance payment term			1 year
KMEs
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Number of KMEs with severance agreements | employee				4
KMEs | Change of control severance agreements
Change of Control agreements
Severance payment term		1 year
Term of health insurance coverage included in severance agreement		1 year
Time period in which an employee can voluntarily terminate employment after a change of control event and still receive salary and health insurance benefits		1 year