Stockholders' Equity (Common Stock) (Details)					1 Months Ended							4 Months Ended	12 Months Ended
	Nov. 13, 2015 USD ($) shares	Dec. 10, 2014 USD ($) shares	Nov. 21, 2014 USD ($) shares	Nov. 07, 2013 shares	Nov. 30, 2015 USD ($) shares	Dec. 31, 2014 $ / shares shares	Nov. 30, 2014 USD ($) $ / shares shares	Sep. 30, 2014 $ / shares shares	Jan. 31, 2014 USD ($) shares	Nov. 30, 2013 USD ($) shares	Oct. 31, 2012 USD ($) $ / shares shares	Oct. 31, 2010 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) shares	Dec. 31, 2012 shares
Class of Stock [Line Items]
Shares authorized, common stock						50,000,000							50,000,000	50,000,000
Shares authorized, preferred stock													5,000,000
Par value, common stock | $ / shares						$ 0.0001							$ 0.0001	$ 0.0001
Par value, preferred stock | $ / shares													$ 0.0001
Common stock outstanding						15,249,118							15,746,288	15,249,118
Proceeds from issuance of common stock | $												$ 965	$ (18,000)	$ 38,846,000	$ 0
Shares reserved for issuance upon completion of certain documentation													195,834
Common Stock [Member]
Class of Stock [Line Items]
Reverse stock split							0.16396
Common stock outstanding						15,249,118							15,746,288	15,249,118	1,851,319	1,695,720
Issuance of restricted stock (in shares)											113,085	1,582,635		335,673
Shares issued, price per share (in USD per share) | $ / shares											$ 1.22	$ 0.0001
Proceeds from issuance of common stock | $											$ 138,000
Issuance of common stock in initial public offering (in shares)													0	3,846,154
Proceeds from IPO issuance | $							$ 42,900,000
Issuance costs | $							$ 4,100,000
Issuance of common stock upon conversion of preferred stock (in shares)							6,834,476							6,834,476
Issuance of common stock, acquisitions (in shares)													233,679	577,486	155,599
Restricted Stock [Member]
Class of Stock [Line Items]
Awards granted in period (shares)							41,664	294,010					242,500	401,244	0
Grant date fair value of awards granted (in dollars per share) | $ / shares							$ 12.00	$ 8.73
Stock Options [Member]
Class of Stock [Line Items]
Options outstanding (in shares)						665,210							778,388	665,210	357,991	187,622
Share-based Compensation Award, Tranche One [Member] | Restricted Stock [Member]
Class of Stock [Line Items]
Awards granted in period (shares)								40,990
Vesting period of stock options								3 years
Share-based Compensation Award, Tranche Two [Member] | Restricted Stock [Member]
Class of Stock [Line Items]
Awards granted in period (shares)								253,020
Vesting period of stock options								4 years
Common Stock [Member] | ComSci [Member]
Class of Stock [Line Items]
Numbers of share issued in acquisition				155,599					1,803,574	155,599
Value of shares issued in acquisition | $										$ 275,000
Common Stock [Member] | Solution Q [Member]
Class of Stock [Line Items]
Numbers of share issued in acquisition			150,977				150,977
Value of shares issued in acquisition | $			$ 1,600,000				$ 1,600,000
Vesting period of stock options							2 years
Common Stock [Member] | Mobile Commons [Member]
Class of Stock [Line Items]
Numbers of share issued in acquisition		386,253				386,253
Value of shares issued in acquisition | $		$ 4,500,000											$ 4,500,000
Issuance of common stock, acquisitions (in shares)													316,747
Issuance of common stock to be held in escrow, acquisitions (in shares)													44,192
Escrow holding period													18 months
Shares reserved for issuance upon completion of certain documentation													25,314
Common Stock [Member] | Ultriva, Inc. [Member]
Class of Stock [Line Items]
Numbers of share issued in acquisition	179,298				179,298
Value of shares issued in acquisition | $	$ 1,400,000				$ 1,388,000
IPO [Member] | Common Stock [Member]
Class of Stock [Line Items]
Shares issued, price per share (in USD per share) | $ / shares							$ 12.00
Issuance of common stock in initial public offering (in shares)							3,846,154
Employee [Member] | Common Stock [Member] | Solution Q [Member]
Class of Stock [Line Items]
Numbers of share issued in acquisition							65,570
Value of shares issued in acquisition | $							$ 700,000
Employee [Member] | Common Stock [Member] | Ultriva, Inc. [Member]
Class of Stock [Line Items]
Numbers of share issued in acquisition					45,767
Value of shares issued in acquisition | $					$ 400,000
Research and Development Expense [Member] | Investor [Member]
Class of Stock [Line Items]
Noncash charge recorded in research and development | $									$ 11,200,000
Upland Software, Inc. 2010 Stock Plan [Member] | Stock Options [Member]
Class of Stock [Line Items]
Options outstanding (in shares)													383,073