Business Combinations - Additional Information (Detail)				1 Months Ended				3 Months Ended					6 Months Ended	12 Months Ended
	Dec. 21, 2015 USD ($)	Aug. 17, 2015 USD ($)	Mar. 13, 2015 USD ($)	Aug. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2016 USD ($)	Sep. 30, 2017 USD ($)	Mar. 31, 2017 USD ($) Earnout_Period	Dec. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Jun. 30, 2017 Earnout_Period	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Increase in total purchase price														$ (252,000)	$ (725,000)
Payment of contingent earnout consideration														$ 5,189,000	2,214,000
Direct acquisition costs															430,000	$ 1,754,000
M2 Dynamics [Member]
Business Acquisition [Line Items]
Acquisition date														Dec. 21, 2015
Purchase price consideration	$ 19,800,000
Initial cash consideration	16,100,000														93,000	16,736,000
Working capital adjustment	596,000
Initial cash consideration increased	3,000,000
Increase in carrying value of goodwill												$ 93,000			73,000
Earnout period														1 year
Earnout consideration														$ 6,600,000
Earnout period completed						12 months
Payment of contingent earnout consideration						$ 5,100,000
Direct transaction costs						430,000				$ 430,000					430,000	801,000
Business combination revenue recorded																247,000
Business combination net loss recorded																(118,000)
Purchase price consideration	$ 19,771,000
M2 Dynamics [Member] | Restatement Adjustment [Member]
Business Acquisition [Line Items]
Increase in total purchase price									$ 651,000	662,000
Branchbird [Member]
Business Acquisition [Line Items]
Acquisition date														Aug. 17, 2015
Purchase price consideration		$ 4,200,000
Initial cash consideration		2,700,000														2,755,000
Working capital adjustment		19,000
Initial cash consideration increased		1,400,000
Earnout period													1 year
Earnout consideration		2,400,000
Earnout period completed														12 months
Payment of contingent earnout consideration				$ 0										$ 0
Direct acquisition costs																340,000
Number of consecutive earnout period | Earnout_Period													2
Reversal of expense previously recoreded as contingent earnout consideration								$ 856,000
Purchase price consideration		$ 4,183,000
Branchbird [Member] | Restatement Adjustment [Member]
Business Acquisition [Line Items]
Increase in total purchase price										221,000	$ 798,000
Zero2Ten [Member]
Business Acquisition [Line Items]
Acquisition date														Mar. 13, 2015
Initial cash consideration			$ 4,500,000													4,643,000
Working capital adjustment			457,000
Initial cash consideration increased			4,400,000
Earnout period									1 year
Direct acquisition costs																$ 613,000
Number of consecutive earnout period | Earnout_Period									2
Purchase price consideration			9,010,000
Gross cash consideration			$ 5,000,000
Business combination, accrued contingent earnout considerations reversed					$ 47,000	$ 238,000			$ 47,000	$ 238,000	$ 130,000				$ 238,000
Zero2Ten [Member] | First Earnout Period [Member]
Business Acquisition [Line Items]
Earnout period completed							12 months
Payment of contingent earnout consideration							$ 3,900,000
Zero2Ten [Member] | Second Earnout Period [Member]
Business Acquisition [Line Items]
Earnout period completed					12 months
Payment of contingent earnout consideration					$ 3,000,000