Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands			6 Months Ended
	Jun. 15, 2016	Apr. 14, 2016	Jun. 30, 2016	Jun. 30, 2015
Related Party Transaction [Line Items]
Common stock shares issued under private placement offer		591,860
Proceeds from private placement and subsequent financing, net of issuance costs		$ 14,200	$ 20,619	$ 0
Aggregate payment of Placement agent, escrow agents and legal fees		$ 1,800
FastPartner AB [Member]
Related Party Transaction [Line Items]
Common stock shares issued under private placement offer	566,962
Midroc Invest AB [Member]
Related Party Transaction [Line Items]
Common stock shares issued under private placement offer	636,838
Xenella Holding AB [Member]
Related Party Transaction [Line Items]
Common stock shares issued under private placement offer	162,928
Private Placement [Member]
Related Party Transaction [Line Items]
Common stock shares issued under private placement offer	334,169	591,860
Proceeds from private placement and subsequent financing, net of issuance costs	$ 8,000	$ 14,200