Acquisition and Related Goodwill - Additional Information (Details) $ / shares in Units, $ in Thousands	Jan. 05, 2018 USD ($)	Sep. 25, 2017 USD ($) company $ / shares shares	Mar. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($)	Mar. 31, 2017 USD ($) $ / shares
Business Acquisition [Line Items]
Common stock, par value (in dollars per share) | $ / shares			$ 0.01		$ 0.01
Goodwill			$ 1,719		$ 0
Number of merged companies | company		2
Infinia Technology Corporation (ITC)
Business Acquisition [Line Items]
Consideration transferred, excluding contingent consideration		$ 3,800
Cash		$ 100
Business combination, stock issued (in shares) | shares		884,890
Common stock, par value (in dollars per share) | $ / shares		$ 0.01
Fair value per acquiree share (in dollars per share) | $ / shares		$ 4.02
Resale registration statement, filing period, maximum		10 days
Period for Make Whole Payment		90 days
Liability for contingent consideration		$ 600		$ 700
Make Whole Payment	$ 700
Core technology and know-how		3,400
Working capital		200
Long-term deferred tax liability		1,100	1,100
Business combination, fair value		4,200
Acquisition costs, expensed (less than 0.1 million)		100
Goodwill		$ 1,700	$ 1,700