Note 2 - Fair Value Measurement

6 Months Ended

Jun. 30, 2014

Fair Value Disclosures [Abstract]

Fair Value Disclosures [Text Block]

2. Fair value measurement

As a basis for determining the fair value of certain of the Company’s financial instruments, the Company utilizes a three-tier value hierarchy, which prioritizes the inputs used in measuring fair value as follows:

Level I—Observable inputs such as quoted prices in active markets for identical assets or liabilities.

Level II—Observable inputs, other than Level I prices, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level III—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

This hierarchy requires the Company to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value. The carrying amount of certain of the Company’s financial instruments, including cash, accounts receivable, prepaid expenses and other assets, accounts payable, and accrued liabilities approximate fair value due to their short maturities.

The Company’s financial instruments that are measured at fair value on a recurring basis consist only of an ordinary share warrant liability. Assets and liabilities measured at fair value are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the entire fair value measurement requires management to make judgments and consider factors specific to the asset or liability.

The following table presents information about the warrant liability that was measured at fair value on a recurring basis and indicates the fair value hierarchy of the valuation techniques it utilized to determine such fair value. In general, fair values determined by Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets or liabilities. Fair values determined by Level 2 inputs utilize data points that are observable such as quoted prices, interest rates, and yield curves. Fair values determined by Level 3 inputs are unobservable data points for the asset or liability, and include situations where there is little, if any, market activity for the asset or liability. The Company did not have any financial liabilities carried at fair value as of June 30, 2014.

			Fair value measurements at December 31, 2013 using
(in thousands)	December 31, 2013		Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Liabilities:
Ordinary share warrants	$	296	$	—	$	—	$	296
Total	$	296	$	—	$	—	$	296

In May 2013, the Company entered into a loan and security agreement with Square 1 Bank that provided for an initial borrowing of $6.0 million and, subject to the achievement of certain revenue milestones, the ability to borrow an additional $1.0 million in January 2014. The Company also received access to a $5.0 million revolving line of credit. The Company concurrently issued a warrant to purchase up to 15,791 ordinary shares of the Company at an exercise price of $0.80 per share. Due to the lack of market quotes relating to the Company’s ordinary share warrants, the fair value of the warrants was determined using the Black-Scholes model, which is based on Level 3 inputs. In December 2013, the Company repaid the loan in full and canceled the line of credit.

In April 2014, Square 1 Bank converted its warrant and received 15,148 ordinary shares of the Company, in accordance with a formula stated in the warrant agreement. Prior to the warrant conversion, the fair value of the warrant was adjusted to its fair value at the date of exercise of $318,000, with the loss on change in fair value recorded in the statement of operations. The liability for the warrant on conversion was then reclassified to additional paid-in capital.

The following table provides a summary of changes in the fair value of the Company's Level 3 financial liabilities for the three and six month periods ended June 30, 2014:

(in thousands)	Three months ended June 30, 2014			Six months ended June 30, 2014
Balance – beginning	$	306		$	296
Change in fair value of warrant liability		12			22
Reclassification of liability to additional paid-in capital upon exercise of warrants		(318	)		(318	)
Balance at June 30, 2014	$	—		$	—