XML 37 R21.htm IDEA: XBRL DOCUMENT
v3.19.1

Share Based Payments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Summary of Stock Option Activity | The following is a summary of stock option activity for the year ended December 31, 2018 and 2017:
|  |  |  |  |  | Weighted Average |  |  | Aggregate |
|  |  |  |  |  | Exercise Price |  |  | Intrinsic Value |
|  | Number of Options |  |  | in CAD$ |  |  | in CAD$ |
Outstanding as of December 31, 2016 |  |  | 1,969,000 |  |  | $ | 6.00 |  |  | $ | 8,218 |
Granted |  |  | 868,902 |  |  |  | 11.15 |  |  |  |  |
Forfeited |  |  | (153,067 | ) |  |  | 11.45 |  |  |  |  |
Cancelled |  |  | (62,689 | ) |  |  | 13.75 |  |  |  |  |
Exercised (1) |  |  | (173,500 | ) |  |  | 5.15 |  |  |  |  |
Outstanding as of December 31, 2017 |  |  | 2,448,646 |  |  | $ | 7.35 |  |  | $ | 21,089 |
|  |  |  |  |  | in USD$ |  |  | in USD$ |
Granted |  |  | 1,011,406 |  |  | $ | 10.12 |  |  |  |  |
Forfeited |  |  | (53,503 | ) |  |  | 9.89 |  |  |  |  |
Exercised (2) |  |  | (98,500 | ) |  |  | 3.10 |  |  |  |  |
Outstanding as of December 31, 2018 |  |  | 3,308,049 |  |  | $ | 7.14 |  |  | $ | 8,308 |
Exercisable as of December 31, 2018 |  |  | 1,918,672 |  |  | $ | 3.18 |  |  | $ | 7,616 |
(1) For the year ended December 31, 2017, 20,000 stock options were exercised on a cashless basis resulting in 14,095 shares being withheld in satisfaction of the exercise price. |
(2) For the year ended December 31, 2018, 8,500 stock options were exercised on a cashless basis resulting in 3,280 shares being withheld in satisfaction of the exercise price. |
Summary of Stock-Based Compensation Expense is Classified in Condensed Consolidated Statements of Operations and Comprehensive Loss | Stock-based compensation expense is classified in the Company’s consolidated statements of operations and comprehensive loss as follows (amounts in thousands):
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |
Research and development |  | $ | 939 |  |  | $ | 343 |
General and administrative |  |  | 7,156 |  |  |  | 1,475 |
|  | $ | 8,095 |  |  | $ | 1,818 |
Employee and Director Stock Options |
Summary of Stock Options Outstanding and Exercisable | The following table summarizes stock options outstanding and exercisable by employees and directors as of December 31, 2018:
|  |  |  |  |  | Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of |  |  |  |  | Remaining |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Number of |
Options |  |  |  |  | Contractual Life |  |  | Exercise |  |  | Fair Value |  |  | Grant Date |  |  | Options |
Outstanding |  |  | Expiration Date |  | (In Years) |  |  | Price |  |  | Post Modification (1) |  |  | Fair Value |  |  | Exercisable |
| 360,000 |  |  | June 18, 2019 |  |  | 0.46 |  |  | $ | 2.77 |  |  | $ | 6.62 |  |  | $ | — |  |  |  | 360,000 |
| 80,000 |  |  | June 18, 2019 |  |  | 0.46 |  |  | $ | 2.77 |  |  | $ | 6.62 |  |  | $ | — |  |  |  | 80,000 |
| 20,000 |  |  | December 8, 2019 |  |  | 0.94 |  |  | $ | 12.72 |  |  | $ | 2.18 |  |  | $ | — |  |  |  | 20,000 |
| 80,000 |  |  | December 8, 2019 |  |  | 0.94 |  |  | $ | 12.72 |  |  | $ | 2.18 |  |  | $ | — |  |  |  | 80,000 |
| 20,000 |  |  | March 16, 2020 |  |  | 1.21 |  |  | $ | 12.52 |  |  | $ | 2.43 |  |  | $ | — |  |  |  | 20,000 |
| 150,000 |  |  | October 21, 2020 |  |  | 1.81 |  |  | $ | 3.20 |  |  | $ | 6.57 |  |  | $ | — |  |  |  | 150,000 |
| 20,000 |  |  | December 31, 2020 |  |  | 2.00 |  |  | $ | 4.48 |  |  | $ | 5.86 |  |  | $ | — |  |  |  | 20,000 |
| 595,000 |  |  | July 13, 2020 |  |  | 1.53 |  |  | $ | 5.35 |  |  | $ | 5.18 |  |  | $ | — |  |  |  | 595,000 |
| 20,000 |  |  | August 8, 2020 |  |  | 1.60 |  |  | $ | 4.98 |  |  | $ | 5.42 |  |  | $ | — |  |  |  | 20,000 |
| 617,000 |  |  | April 17, 2027 |  |  | 8.29 |  |  | $ | 8.13 |  |  | $ | 7.54 |  |  | $ | — |  |  |  | 154,250 |
| 6,146 |  |  | May 18, 2027 |  |  | 8.37 |  |  | $ | 7.35 |  |  | $ | 4.75 |  |  | $ | — |  |  |  | 4,610 |
| 10,000 |  |  | May 18, 2027 |  |  | 8.37 |  |  | $ | 7.35 |  |  | $ | 7.65 |  |  | $ | — |  |  |  | 2,500 |
| 30,000 |  |  | August 8, 2027 |  |  | 8.60 |  |  | $ | 10.38 |  |  | $ | 7.38 |  |  | $ | — |  |  |  | 7,500 |
| 25,000 |  |  | April 9, 2028 |  |  | 9.27 |  |  | $ | 9.03 |  |  | $ | 8.01 |  |  | $ | — |  |  |  | — |
| 337,500 |  |  | May 15, 2028 |  |  | 9.37 |  |  | $ | 10.99 |  |  | $ | 7.89 |  |  | $ | — |  |  |  | 85,313 |
| 150,000 |  |  | July 9, 2028 |  |  | 9.52 |  |  | $ | 9.69 |  |  | $ | — |  |  | $ | 6.83 |  |  |  | — |
| 75,726 |  |  | August 22, 2028 |  |  | 9.64 |  |  | $ | 10.23 |  |  | $ | — |  |  | $ | 7.21 |  |  |  | — |
| 13,177 |  |  | September 4, 2028 |  |  | 9.67 |  |  | $ | 10.19 |  |  | $ | — |  |  | $ | 7.19 |  |  |  | — |
| 50,000 |  |  | September 10, 2028 |  |  | 9.69 |  |  | $ | 10.34 |  |  | $ | — |  |  | $ | 7.30 |  |  |  | — |
| 50,000 |  |  | September 24, 2028 |  |  | 9.73 |  |  | $ | 9.71 |  |  | $ | — |  |  | $ | 6.79 |  |  |  | — |
| 1,500 |  |  | October 8, 2028 |  |  | 9.76 |  |  | $ | 8.25 |  |  | $ | — |  |  | $ | 5.84 |  |  |  | — |
| 75,000 |  |  | October 15, 2028 |  |  | 9.78 |  |  | $ | 8.75 |  |  | $ | — |  |  | $ | 6.19 |  |  |  | — |
| 100,000 |  |  | October 22, 2028 |  |  | 9.80 |  |  | $ | 10.16 |  |  | $ | — |  |  | $ | 7.20 |  |  |  | — |
| 10,000 |  |  | October 29, 2028 |  |  | 9.82 |  |  | $ | 9.71 |  |  | $ | — |  |  | $ | 6.87 |  |  |  | — |
| 20,000 |  |  | November 19, 2028 |  |  | 9.88 |  |  | $ | 8.00 |  |  | $ | — |  |  | $ | 5.66 |  |  |  | — |
| 20,000 |  |  | December 3, 2028 |  |  | 9.92 |  |  | $ | 8.66 |  |  | $ | — |  |  | $ | 6.13 |  |  |  | — |
| 15,000 |  |  | December 17, 2028 |  |  | 9.96 |  |  | $ | 9.42 |  |  | $ | — |  |  | $ | 6.66 |  |  |  | — |
| 2,951,049 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,599,172 |
(1) Reflects fair value of modified stock options on August 8, 2018 |  |  |  |  |  |  |  |  |
Estimation Using Black-Scholes Option Pricing Model With Following Weighted Average Assumptions | The fair value of employee and director stock options granted for the years ended December 31, 2018 and 2017 had a weighted average grant date fair value of $7.78 and CAD$4.34 per option, respectively, and they were estimated using the Black-Scholes option-pricing model with the following weighted-average assumptions:
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |
Stock price |  | $11.21 |  |  | CAD$10.40 |
Exercise price |  | $10.12 |  |  | CAD$10.85 |
Expected term |  | 6.25 years |  |  | 6.25 years |
Expected volatility |  |  | 78.99 | % |  |  | 90.84 | %
Risk-free interest rate |  |  | 2.67 | % |  |  | 1.06 | %
Dividend rate |  |  | 0.00 | % |  |  | 0.00 | %
Consultants Stock Option |
Summary of Stock Options Outstanding and Exercisable | The following table summarizes stock options outstanding and exercisable by consultants as of December 31, 2018:
|  |  |  |  |  | Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of |  |  |  |  | Remaining |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Number of |
Options |  |  |  |  | Contractual Life |  |  | Exercise |  |  | Fair Value |  |  | Grant Date |  |  | Options |
Outstanding |  |  | Expiration Date |  | (In Years) |  |  | Price |  |  | Post Modification (1) |  |  | Fair Value |  |  | Exercisable |
| 80,000 |  |  | June 18, 2019 |  |  | 0.46 |  |  | $ | 2.77 |  |  | $ | 6.62 |  |  | $ | — |  |  |  | 80,000 |
| 30,000 |  |  | December 8, 2019 |  |  | 0.94 |  |  | $ | 12.72 |  |  | $ | 2.18 |  |  | $ | — |  |  |  | 30,000 |
| 72,000 |  |  | October 3, 2020 |  |  | 1.76 |  |  | $ | 5.15 |  |  | $ | 5.35 |  |  | $ | — |  |  |  | 72,000 |
| 110,000 |  |  | October 28, 2020 |  |  | 1.82 |  |  | $ | 3.18 |  |  | $ | 6.59 |  |  | $ | — |  |  |  | 110,000 |
| 20,000 |  |  | May 18, 2027 |  |  | 8.37 |  |  | $ | 7.35 |  |  | $ | 7.65 |  |  | $ | — |  |  |  | 5,000 |
| 15,000 |  |  | August 8, 2027 |  |  | 8.60 |  |  | $ | 10.38 |  |  | $ | 7.38 |  |  | $ | — |  |  |  | 3,750 |
| 15,000 |  |  | November 6, 2027 |  |  | 8.84 |  |  | $ | 16.20 |  |  | $ | 6.98 |  |  | $ | — |  |  |  | 3,750 |
| 15,000 |  |  | August 22, 2028 |  |  | 9.64 |  |  | $ | 10.23 |  |  | $ | — |  |  | $ | 8.87 |  |  |  | 15,000 |
| 357,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 319,500 |
(1) Reflects fair value of modified stock options on August 8, 2018 |  |  |  |  |  |  |  |  |
Estimation Using Black-Scholes Option Pricing Model With Following Weighted Average Assumptions | Stock options granted to the Company’s consultants for the years ended December 31, 2018 and 2017 had a weighted average grant date fair value of $8.87 and CAD$3.88 per share, respectively, and they were estimated using the Black-Scholes option-pricing model with the following weighted-average assumptions:
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |
Stock price |  | $10.23 |  |  | CAD$12.15 |
Exercise price |  | $10.23 |  |  | CAD$12.20 |
Option term |  | 10 years |  |  | 10 years |
Expected volatility |  |  | 90.17 | % |  |  | 91.02 | %
Risk-free interest rate |  |  | 2.82 | % |  |  | 1.60 | %
Dividend rate |  |  | 0.00 | % |  |  | 0.00 | %
Non-employee Liability |
Estimation Using Black-Scholes Option Pricing Model With Following Weighted Average Assumptions | The fair value of non-employee stock options previously classified as liabilities and recorded as derivative financial instruments which were subsequently reclassified to equity following the modification of stock option previously on August 8, 2018 were estimated using the Black-Scholes option pricing model with the following weighted-average assumptions as of August 8, 2018 and December 31, 2017:
|  | August 8, 2018 |  |  | December 31, 2017 |
Stock price |  | CAD$12.14 |  |  | CAD$15.95 |
Exercise price |  | CAD$4.383 |  |  | CAD$4.30 |
Expected life |  | 0.93 years |  |  | 1.51 years |
Expected volatility |  |  | 73.18 | % |  |  | 61.58 | %
Risk-free interest rate |  |  | 1.95 | % |  |  | 1.61 | %
Dividend rate |  |  | 0.00 | % |  |  | 0.00 | %
Summary of Non-Employee Stock Options Accounted for As Derivative Financial Instruments | The following table summarizes non-employee stock options that had been accounted for as derivative financial instruments during the years ended December 31, 2018 and 2017 (amounts in thousands):
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |
Fair value of non-employee stock options at beginning of year |  | $ | 2,637 |  |  | $ | 1,617 |
Exercise of non-employee options |  |  | (737 | ) |  |  | (156 | )
Cancelled |  |  | — |  |  |  | (294 | )
Foreign exchange gains |  |  | (38 | ) |  |  | — |
Change in fair value of non-employee stock options during the year |  |  | (656 | ) |  |  | 1,470 |
Reclassification to additional paid-in capital |  |  | (1,206 | ) |  |  | — |
Fair value of non-employee stock options at end of year |  | $ | — |  |  | $ | 2,637 |
Restricted Stock Units |
Summary of Company’s Restricted Stock Unit Activity | The following is a summary of the Company’s RSU activity for the year ended December 31, 2018 and 2017:
|  | Number of Restricted Stock Units |  |  | Weighted Average Grant Date Fair Value per Unit (CAD) |
Outstanding as of January 1, 2017 |  |  | — |  |  | $ | — |
Granted |  |  | 8,097 |  |  |  | 10.00 |
Forfeited |  |  | (3,182 | ) |  |  | 10.00 |
Vested and settled during 2017 (1) |  |  | (2,987 | ) |  |  | 10.00 |
Outstanding as of December 31, 2017 |  |  | 1,928 |  |  | $ | 10.00 |
Vested and settled during 2018 (2) |  |  | (964 | ) |  |  | 10.00 |
Outstanding as of December 31, 2018 |  |  | 964 |  |  | $ | 10.00 |
(1) Includes 723 RSUs withheld to satisfy required withholding taxes. |  |  |  |  |  |  |  |
(2) Includes 259 RSUs withheld to satisfy required withholding taxes. |  |  |  |  |  |  |  |

X
- Definition Schedule of non employee share based compensation arrangements fair values. + References No definition available. + Details
Name: | hsdt_ScheduleOfNonEmployeeShareBasedCompensationArrangementsFairValuesTableTextBlock
Namespace Prefix: | hsdt_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
Name: | us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=hsdt_EmployeeAndDirectorStockOptionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=hsdt_ConsultantsStockOptionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=hsdt_NonEmployeeLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |