Short-term investments (Tables)

3 Months Ended

Mar. 31, 2017

Short-term investments

Schedule of short-term investments

	As of December 31, 2016
(in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Short-term investments:	$	—	$	—	$	—		$	—
Available-for-sale investments	$	51,094	$	—	$	(18	)	$	51,076
Term deposits	$	30	$	—	$	—		$	30
Total	$	51,124	$	—	$	(18	)	$	51,106

	As of March 31, 2017
(in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Short-term investments:	$	—	$	—	$	—		$	—
Available-for-sale investments	$	41,047	$	—	$	(16	)	$	41,031
Term deposits	$	30	$	—	$	—		$	30
Total	$	41,077	$	—	$	(16	)	$	41,061