Subsequent Event (Details) - VIEVU, LLC - Subsequent Event	May 03, 2018 USD ($) $ / shares shares
Subsequent Event [Line Items]
Consideration transferred	$ 4,600,000
Shares transferred (in shares) | shares	58,843
Common stock, aggregate value	$ 2,500,000.0
Business acquisition, share price, period leading up to three business days prior to closing date	20 days
Business acquisition, share price | $ / shares	$ 42.49
Contingent consideration	$ 6,000,000.0
Business combination, contingent consideration, liability, number of shares | shares	141,226