Business Acquisitions Business Acquisition details (Details) - USD ($)	Aug. 01, 2016	Jan. 15, 2015	Dec. 31, 2016	Apr. 02, 2016
Business Acquisition [Line Items]
Shares Granted As Consideration - Contingent			$ 0
Business Combination Contingent Consideration Arrangements Shares Recovered			63,114
Business Combination Contingent Consideration Arrangement Shares Recovered price per share			$ 6.30
Visicon [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 3,300,000
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Costs	1,200,000
Acquisition Costs, Period Cost	500,000
Payments to Acquire Businesses, Gross	$ 2,000,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	637,082
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	$ 4,500,000
Business Acquisition Equity Interests Issued Or Issuable Number Of Shares Issued in Escrow	33,143
Topwin [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles				$ 3,500,000
Business Combination, Bargain Purchase, Total Gain		$ 3,600,000
Payments to Acquire Businesses, Gross		$ 7,600,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares		748,944
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned		$ 2,900,000
Developed Technology Rights [Member] | Visicon [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 2,000,000