The Company (Details) $ in Thousands		3 Months Ended	12 Months Ended
	Jun. 22, 2015 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2016 USD ($) Systems Channel shares	Dec. 31, 2015 USD ($) shares
Liquidity [Abstract]
Accumulated deficit			$ (210,575)	$ (207,240)
Reverse stock-split ratio			0.10
Revenue Recognition [Abstract]
Number of distribution channels | Channel			2
Accounts Receivable, Net [Abstract]
Allowance for doubtful accounts			$ 135	45
Inventories [Abstract]
Reserves on inventory			257
Inventory write-offs			$ 0	4,818
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life			5 years
Write-down, property and equipment		$ 920	$ 0	920
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets			0
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of debt			20,082	15,958
Product Warranty Accrual [Roll Forward]
Accrual at beginning of year			226	48
Acquired in asset purchase			0	265
Additions charged to warranty expense			196	98
Expiring warranties/claimed satisfied			(307)	(185)
Total			115	226
Less: current portion			(102)	(168)
Accrued warranty, non-current portion			13	58
Earnings Per Share [Abstract]
Net loss			(3,335)	(27,909)
Gain on the change in fair value of the warrant liability			(5,396)	$ (1,814)
Diluted loss			$ (8,731)
Weighted average number of common and common equivalent shares outstanding [Abstract]
Basic number of common shares outstanding (in shares) | shares			10,595,068	8,536,699
Dilutive effect of warrants (in shares) | shares			983,505
Diluted number of common and common stock equivalent shares outstanding (in shares) | shares			11,578,573	8,536,699
Advertising Costs [Abstract]
Advertising expense			$ 4,389	$ 2,500
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common stock equivalents (in shares) | shares			64,981,515	68,384,707
Minimum [Member]
Product Warranty Liability [Line Items]
Standard warranty period			1 year
Offered warranty period			3 years
Maximum [Member]
Product Warranty Liability [Line Items]
Standard warranty period			2 years
Offered warranty period			4 years
Computer Hardware and Software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life			3 years
Computer Hardware and Software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life			7 years
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life			3 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life			7 years
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life			3 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life			7 years
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liability (Note 12)			$ 105	$ 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 12)			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 12)			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 12)			$ 105	$ 7,042
Patents and Licensed Technologies [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life			8 years
Patents and Licensed Technologies [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life			12 years
Core Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life			10 years
Product Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life			5 years
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life			10 years
XTRAC and VTRAC [Member]
Business Acquisition [Line Items]
Acquisition price	$ 42,528
XTRAC and VTRAC [Member] | Core Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life			10 years
XTRAC and VTRAC [Member] | Product Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life			5 years
XTRAC [Member]
Business Acquisition [Line Items]
Number of systems placed in dermatologists offices | Systems			775
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			46,105,715	46,435,127
Common Stock Purchase Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common stock equivalents (in shares) | shares			12,033,098	16,729,362
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			2,339,180	2,535,866
Common Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common stock equivalents (in shares) | shares			4,503,522	2,684,352