The Company (Details) $ in Thousands		3 Months Ended
	Jun. 22, 2015 USD ($)	Mar. 31, 2016 USD ($) Systems shares	Mar. 31, 2015 USD ($) shares	Dec. 31, 2015 USD ($)
Liquidity [Abstract]
Accumulated deficit		$ (208,677)		$ (207,240)
Fair Value Assets And Liabilities, Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of debt		18,251		15,958
Product Warranty Accrual [Roll Forward]
Accrual at beginning of year		226
Additions charged to warranty expense		72
Expiring warranties/claimed satisfied		(119)
Total		179
Less: current portion		(155)		(168)
Accrued warranty, non-current portion		24
Earnings Per Share [Abstract]
Net loss		(1,437)
Change in fair value of warrant liability		(1,985)	$ 1,334
Diluted earnings		$ (3,422)
Weighted average number of common and common equivalent shares outstanding:
Basic number of common shares outstanding (in shares) | shares		10,339,657	6,471,906
Dilutive effect of warrants (in shares) | shares		2,968,266
Diluted number of common and common stock equivalent shares outstanding (in shares) | shares		13,307,923	6,471,906
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common stock equivalents (in shares) | shares		68,149,706	22,708,493
Minimum [Member]
Product Warranty Liability [Line Items]
Standard warranty period		1 year
Maximum [Member]
Product Warranty Liability [Line Items]
Standard warranty period		2 years
Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities, Measured On Recurring And Nonrecurring Basis [Line Items]
Warrant liability (Note 10)		$ 5,057		7,042
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Assets And Liabilities, Measured On Recurring And Nonrecurring Basis [Line Items]
Warrant liability (Note 10)		0		0
Fair Value, Measurements, Recurring [Member] | Significant other Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities, Measured On Recurring And Nonrecurring Basis [Line Items]
Warrant liability (Note 10)		0		0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Assets And Liabilities, Measured On Recurring And Nonrecurring Basis [Line Items]
Warrant liability (Note 10)		$ 5,057		$ 7,042
XTRAC and VTRAC [Member]
Business Acquisition [Line Items]
Acquisition price	$ 42,528
XTRAC [Member]
Business Acquisition [Line Items]
Number of systems placed in dermatologists offices | Systems		730
Common Stock Equivalents of Convertible Debentures [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common stock equivalents (in shares) | shares		46,215,126	4,328,466
Common Stock Purchase Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common stock equivalents (in shares) | shares		16,729,362	13,078,920
Common Stock Equivalents of Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common stock equivalents (in shares) | shares		2,535,866	4,007,406
Common Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common stock equivalents (in shares) | shares		2,669,352	1,293,701