Investments (Tables)

12 Months Ended

Dec. 31, 2016

Investments

Schedule of changes in fair value

	Year ended December 31, 2016
									Fair value of
	Asset at the				Impairment				purchase consideration		Asset at the
	beginning of				of cost method		Decrease in		for business		end of
	the period		Additions		investment		fair value		acquisition		the period
Convertible promissory note investment in Plain Vanilla Corp.	$	—	$	5,100	$	—	$	(1,900)	$	(3,200)	$	—
Call option to acquire Plain Vanilla Corp.	$	—	$	2,400	$	(2,400)		—	$	—	$	—

Schedule of Fair Value Assumptions

	Nine Months Ended
	September 30,
	2016
Dividend yield	—
Risk-free interest rate	0.41
Expected volatility	63.88
Expected term (in years)	0.68